diff --git a/default_settings.h b/default_settings.h
index 122500c..bf24142 100644
--- a/default_settings.h
+++ b/default_settings.h
@@ -28,6 +28,7 @@ static Q_DECL_CONSTEXPR FolderAtStartup DEFAULT_FOLDER_AT_STARTUP_TYPE = FolderA
 static Q_DECL_CONSTEXPR char DEFAULT_FOLDER_PATH_AT_STARTUP[] = "";
 
 static Q_DECL_CONSTEXPR SectionType DEFAULT_SORT_SECTION_TYPE = SectionType::FileName;
+static Q_DECL_CONSTEXPR SectionType DEFAULT_SORT_SECTION_TYPE_2ND = SectionType::NoSpecify;
 static Q_DECL_CONSTEXPR SortDirsType DEFAULT_SORT_DIRS_TYPE = SortDirsType::NoSpecify;
 static Q_DECL_CONSTEXPR bool DEFAULT_SORT_DOT_FIRST = true;
 static Q_DECL_CONSTEXPR Qt::CaseSensitivity DEFAULT_SORT_CASE_SENSITIVITY = Qt::CaseInsensitive;
diff --git a/settings.cpp b/settings.cpp
index c3b97c4..8ff6f59 100644
--- a/settings.cpp
+++ b/settings.cpp
@@ -91,6 +91,7 @@ void Settings::initialize()
 
     // Left side Sort settings
     m_leftSortSectionType = getValueSortSectionType("left");
+    m_leftSortSectionType2nd = getValueSortSectionType2nd("left");
     m_leftSortDirsType = getValueSortDirsType("left");
     m_leftSortDotFirst = getValueSortDotFirst("left");
     m_leftSortCaseSensitivity = getValueSortCaseSensitivity("left");
@@ -98,6 +99,7 @@ void Settings::initialize()
 
     // Right side Sort settings
     m_rightSortSectionType = getValueSortSectionType("right");
+    m_rightSortSectionType2nd = getValueSortSectionType2nd("right");
     m_rightSortDirsType = getValueSortDirsType("right");
     m_rightSortDotFirst = getValueSortDotFirst("right");
     m_rightSortCaseSensitivity = getValueSortCaseSensitivity("right");
@@ -318,6 +320,7 @@ void Settings::flush()
 
     // Left side Sort settings
     setValueSortSectionType(m_leftSortSectionType, "left");
+    setValueSortSectionType2nd(m_leftSortSectionType2nd, "left");
     setValueSortDirsType(m_leftSortDirsType, "left");
     setValueSortDotFirst(m_leftSortDotFirst, "left");
     setValueSortCaseSensitivity(m_leftSortCaseSensitivity, "left");
@@ -325,6 +328,7 @@ void Settings::flush()
 
     // Right side Sort settings
     setValueSortSectionType(m_rightSortSectionType, "right");
+    setValueSortSectionType2nd(m_rightSortSectionType2nd, "right");
     setValueSortDirsType(m_rightSortDirsType, "right");
     setValueSortDotFirst(m_rightSortDotFirst, "right");
     setValueSortCaseSensitivity(m_rightSortCaseSensitivity, "right");
@@ -595,6 +599,21 @@ SectionType Settings::getValueSortSectionType(const QString& prefix)
     return ret;
 }
 
+SectionType Settings::getValueSortSectionType2nd(const QString& prefix)
+{
+    SectionType ret = DEFAULT_SORT_SECTION_TYPE_2ND;
+
+    QString sortTypeValue = value("main/" + prefix + "SortType2nd").toString();
+    ret = (sortTypeValue == "lastModified") ? SectionType::LastModified :
+          (sortTypeValue == "size") ? SectionType::FileSize :
+          (sortTypeValue == "type") ? SectionType::FileType :
+          (sortTypeValue == "name") ? SectionType::FileName :
+          (sortTypeValue == "none") ? SectionType::NoSpecify :
+                                      DEFAULT_SORT_SECTION_TYPE_2ND;
+
+    return ret;
+}
+
 SortDirsType Settings::getValueSortDirsType(const QString& prefix)
 {
     SortDirsType ret = DEFAULT_SORT_DIRS_TYPE;
@@ -646,6 +665,16 @@ void Settings::setValueSortSectionType(SectionType sectionType, const QString& p
     setValue("main/" + prefix + "SortType", sortTypeValue);
 }
 
+void Settings::setValueSortSectionType2nd(SectionType sectionType2nd, const QString& prefix)
+{
+    QString sortTypeValue = (sectionType2nd == SectionType::LastModified) ? "lastModified" :
+                            (sectionType2nd == SectionType::FileSize) ? "size" :
+                            (sectionType2nd == SectionType::FileType) ? "type" :
+                            (sectionType2nd == SectionType::FileName) ? "name" :
+                                                                        "none";
+    setValue("main/" + prefix + "SortType2nd", sortTypeValue);
+}
+
 void Settings::setValueSortDirsType(SortDirsType dirsType, const QString& prefix)
 {
     QString sortDirsValue = (dirsType == SortDirsType::First) ? "first" :
diff --git a/settings.h b/settings.h
index e27f1c8..fb3f6a5 100644
--- a/settings.h
+++ b/settings.h
@@ -62,22 +62,26 @@ class Settings : public QSettings
     void setRightFolderPath(const QString& rightFolderPath) { m_rightFolderPath = rightFolderPath; }
 
     SectionType getLeftSortSectionType() { return m_leftSortSectionType; }
+    SectionType getLeftSortSectionType2nd() { return m_leftSortSectionType2nd; }
     SortDirsType getLeftSortDirsType() { return m_leftSortDirsType; }
     bool getLeftSortDotFirst() { return m_leftSortDotFirst; }
     Qt::CaseSensitivity getLeftSortCaseSensitivity() { return m_leftSortCaseSensitivity; }
     Qt::SortOrder getLeftSortOrder() { return m_leftSortOrder; }
     void setLeftSortSectionType(SectionType sectionType) { m_leftSortSectionType = sectionType; }
+    void setLeftSortSectionType2nd(SectionType sectionType2nd) { m_leftSortSectionType2nd = sectionType2nd; }
     void setLeftSortDirsType(SortDirsType dirsType) { m_leftSortDirsType = dirsType; }
     void setLeftSortDotFirst(bool dotFirst) { m_leftSortDotFirst = dotFirst; }
     void setLeftSortCaseSensitivity(Qt::CaseSensitivity caseSensitivity) { m_leftSortCaseSensitivity = caseSensitivity; }
     void setLeftSortOrder(Qt::SortOrder order) { m_leftSortOrder = order; }
 
     SectionType getRightSortSectionType() { return m_rightSortSectionType; }
+    SectionType getRightSortSectionType2nd() { return m_rightSortSectionType2nd; }
     SortDirsType getRightSortDirsType() { return m_rightSortDirsType; }
     bool getRightSortDotFirst() { return m_rightSortDotFirst; }
     Qt::CaseSensitivity getRightSortCaseSensitivity() { return m_rightSortCaseSensitivity; }
     Qt::SortOrder getRightSortOrder() { return m_rightSortOrder; }
     void setRightSortSectionType(SectionType sectionType) { m_rightSortSectionType = sectionType; }
+    void setRightSortSectionType2nd(SectionType sectionType2nd) { m_rightSortSectionType2nd = sectionType2nd; }
     void setRightSortDirsType(SortDirsType dirsType) { m_rightSortDirsType = dirsType; }
     void setRightSortDotFirst(bool dotFirst) { m_rightSortDotFirst = dotFirst; }
     void setRightSortCaseSensitivity(Qt::CaseSensitivity caseSensitivity) { m_rightSortCaseSensitivity = caseSensitivity; }
@@ -192,11 +196,13 @@ class Settings : public QSettings
     QColor getValueColorSetting(const QString& key, const QColor& defColor);
 
     SectionType getValueSortSectionType(const QString& prefix);
+    SectionType getValueSortSectionType2nd(const QString& prefix);
     SortDirsType getValueSortDirsType(const QString& prefix);
     bool getValueSortDotFirst(const QString& prefix);
     Qt::CaseSensitivity getValueSortCaseSensitivity(const QString& prefix);
     Qt::SortOrder getValueSortOrder(const QString& prefix);
     void setValueSortSectionType(SectionType sectionType, const QString& prefix);
+    void setValueSortSectionType2nd(SectionType sectionType2nd, const QString& prefix);
     void setValueSortDirsType(SortDirsType dirsType, const QString& prefix);
     void setValueSortDotFirst(bool dotFirst, const QString& prefix);
     void setValueSortCaseSensitivity(Qt::CaseSensitivity caseSensitivity, const QString& prefix);
@@ -226,11 +232,13 @@ class Settings : public QSettings
     QString m_rightFolderPath = DEFAULT_FOLDER_PATH_AT_STARTUP;
 
     SectionType m_leftSortSectionType = DEFAULT_SORT_SECTION_TYPE;
+    SectionType m_leftSortSectionType2nd = DEFAULT_SORT_SECTION_TYPE_2ND;
     SortDirsType m_leftSortDirsType = DEFAULT_SORT_DIRS_TYPE;
     bool m_leftSortDotFirst = DEFAULT_SORT_DOT_FIRST;
     Qt::CaseSensitivity m_leftSortCaseSensitivity = DEFAULT_SORT_CASE_SENSITIVITY;
     Qt::SortOrder m_leftSortOrder = DEFAULT_SORT_ORDER;
     SectionType m_rightSortSectionType = DEFAULT_SORT_SECTION_TYPE;
+    SectionType m_rightSortSectionType2nd = DEFAULT_SORT_SECTION_TYPE_2ND;
     SortDirsType m_rightSortDirsType = DEFAULT_SORT_DIRS_TYPE;
     bool m_rightSortDotFirst = DEFAULT_SORT_DOT_FIRST;
     Qt::CaseSensitivity m_rightSortCaseSensitivity = DEFAULT_SORT_CASE_SENSITIVITY;
diff --git a/types.h b/types.h
index ea33f11..024a5ab 100644
--- a/types.h
+++ b/types.h
@@ -61,6 +61,7 @@ enum class SectionType : int
     FileType,
     FileSize,
     LastModified,
+    NoSpecify,
 
     SectionTypeNum
 };