On the list at content area, press the Increase Indent button in the sidebar to change all list levels.
Steps to Reproduce:
1. Change the layout to "Title, Content"
2. Enter 3 lines at Content area
3. Move the cursor to the second line(bbbbb)
4. Push the "Increase Indent" button on the sidebar
All list lavel are changed.
Only second line list level is changed.
User Profile Reset: Yes
Build ID: 3d775be2011f3886db32dfd395a6a6d1ca2630ff
CPU threads: 8; OS:Linux 5.6; UI render: default; VCL: gtk3;
ロケール: ja-JP (ja_JP.UTF-8); UIの言語: ja-JP
Difference between edit cursor focus (which you had) and object selection (list entries are objects). No object selected so indent action applies to the full list.
Double-click to select the list object with cursor focus. It alone will then follow the indent.
All as designed => NAB and Invalid