diff --git a/.github/workflows/api-review-baselines.yml b/.github/workflows/api-review-baselines.yml
index 521b18774aa..aba373d580a 100644
--- a/.github/workflows/api-review-baselines.yml
+++ b/.github/workflows/api-review-baselines.yml
@@ -191,21 +191,22 @@ jobs:
 
                   section = (
                       f"## API review baseline changes for `{filename}`\n\n"
-                      'The diff below was generated by `ApiChief` between the base and selected PR versions.\n\n')
+                      "<details>\n<summary><strong>Show diff</strong></summary>\n\n"
+                      'The diff below was generated by `ApiChief` between the base and the PR.\n\n')
 
                   for review_file in review_files:
                       section += (
                           f"{review_file.read_text(encoding='utf-8').rstrip()}\n\n")
 
-                  section = section.rstrip()
+                  section = section.rstrip() + '\n\n</details>'
               elif new_exists:
                   section = (
                       f"## API review baseline changes for `{filename}`\n\n"
-                      'This baseline file was **added** in the selected PR.')
+                      'This baseline file was **added** in the PR.')
               elif old_exists:
                   section = (
                       f"## API review baseline changes for `{filename}`\n\n"
-                      'This baseline file was **removed** in the selected PR.')
+                      'This baseline file was **removed** in the PR.')
 
               if not section:
                   continue
diff --git a/eng/Tools/ApiChief/Commands/EmitDelta.cs b/eng/Tools/ApiChief/Commands/EmitDelta.cs
index 47fa5ea97dc..fb21a0ded36 100644
--- a/eng/Tools/ApiChief/Commands/EmitDelta.cs
+++ b/eng/Tools/ApiChief/Commands/EmitDelta.cs
@@ -181,7 +181,7 @@ private static string FormatDiffMarkdown(ApiType type)
         AppendStageDiffLine(lines, type.Additions, '+');
         AppendGroupedDiffMembers(lines, type);
 
-        return $"### `{type.Type}`{Environment.NewLine}{Environment.NewLine}```diff{Environment.NewLine}{string.Join(Environment.NewLine, lines)}{Environment.NewLine}```{Environment.NewLine}";
+        return $"```diff{Environment.NewLine}{string.Join(Environment.NewLine, lines)}{Environment.NewLine}```{Environment.NewLine}";
     }
 
     private static void AppendStageDiffLine(List<string> lines, ApiType? changeSet, char prefix)