diff --git a/static/js/compose_actions.js b/static/js/compose_actions.js
index 7598cd81ea983e..de59bba0f29c62 100644
--- a/static/js/compose_actions.js
+++ b/static/js/compose_actions.js
@@ -118,11 +118,15 @@ function clear_box() {
 }
 
 export function autosize_message_content() {
-    autosize($("#compose-textarea"), {
-        callback() {
-            maybe_scroll_up_selected_message();
-        },
-    });
+    if (compose_height.get_is_full_size()) {
+        maybe_scroll_up_selected_message();
+    } else {
+        autosize($("#compose-textarea"), {
+            callback() {
+                maybe_scroll_up_selected_message();
+            },
+        });
+    }
 }
 
 export function expand_compose_box() {
diff --git a/static/js/compose_height.js b/static/js/compose_height.js
index 8b06f71e2ea664..4ff1d0642e1b8d 100644
--- a/static/js/compose_height.js
+++ b/static/js/compose_height.js
@@ -1,9 +1,6 @@
-// Making this similar to compose_state.js
-
+import autosize from "autosize";
 import $ from "jquery";
 
-import * as compose_ui from "./compose_ui";
-
 const compose_textarea = $("#compose-textarea");
 let is_full_size = false; // true or false
 
@@ -25,6 +22,10 @@ export function get_is_full_size() {
 export function make_compose_box_full_size() {
     set_is_full_size(true);
 
+    // The autosize should be destroyed for the full size compose
+    // box else it will interfare and shrink its size accordingly.
+    autosize.destroy($("#compose-textarea"));
+
     compose_textarea.css("max-height", get_expected_full_height());
     compose_textarea.css("height", get_expected_full_height());
     $("#floating_recipient_bar").css("z-index", -1);
@@ -39,6 +40,10 @@ export function make_compose_box_original_size() {
     compose_textarea.css("max-height", "calc(50vh - 50px)");
     $("#floating_recipient_bar").css("z-index", 98);
 
+    // Again initialise the compose textarea as it was destroyed
+    // when compose box was made full screen
+    autosize($("#compose-textarea"));
+
     $("#collapse_composebox_button").hide();
     $("#expand_composebox_button").show();
 }
diff --git a/static/js/compose_ui.js b/static/js/compose_ui.js
index d6330462d5ec6c..aa95a8fd565296 100644
--- a/static/js/compose_ui.js
+++ b/static/js/compose_ui.js
@@ -1,6 +1,7 @@
 import autosize from "autosize";
 import $ from "jquery";
 
+import * as compose_height from "./compose_height";
 import {$t} from "./i18n";
 import * as people from "./people";
 import * as user_status from "./user_status";
@@ -8,7 +9,9 @@ import * as user_status from "./user_status";
 export function autosize_textarea(textarea) {
     // Since this supports both compose and file upload, one must pass
     // in the text area to autosize.
-    autosize.update(textarea);
+    if (!compose_height.get_is_full_size()) {
+        autosize.update(textarea);
+    }
 }
 
 export function smart_insert(textarea, syntax) {