Right-click on multi-select

Steps:

1. open new data composition
2. add multiple files/folders
3. select multiple entries with Ctrl + A or Shift/Ctrl + Click
4. right-click on one of the selected entries
5. only the entry below the mouse will be selected when the context menu opens

If the context menu appears, it should only have the 'Remove' context menu entry, as the 'Create directory' and 'Rename' wouldn't be applicable.

Tested on Xubuntu 20.04 with Xfburn 0.6.2.