Just noticed something else.

In a Windows window, select any number of files. Now right-click a single file that you did not select and click delete.

Result - One file is deleted.

In XOLOX, select any number of files. Now right-click a single file that you did not select and click Cancel download.

Result - Voila! all the files you previously selected are deleted!

I just paused a bunch of files, decided to delete one other file, and now I've got to find them all over again :-(