slideshow

public/js/modules/editor.js

@@ -517,8 +517,11 @@ const editorPane = $('editor-pane');
 
 function applyEditorSplit() {
     if (!state.previewVisible) return;
-    if (editorPane) editorPane.style.flex = `0 0 ${editorSplit}%`;
-    preview.style.flex = `0 0 ${100 - editorSplit}%`;
+    // Use grow-based splits with flex-basis:0 so both panes share the available
+    // space AFTER the divider is subtracted. Using `0 0 X%` overflows the container
+    // because X% + (100-X)% + divider > 100%, which clips content on the right.
+    if (editorPane) editorPane.style.flex = `${editorSplit} 1 0`;
+    preview.style.flex = `${100 - editorSplit} 1 0`;
 }
 
 $('toggle-preview')?.addEventListener('click', () => {