[Ghitulescu]

I installed some time ago version 3.30 (the latest at that time) on a W10 tablet.
Although I "locked" the screen rotation, one software I ran in parallel to Calibre or Windows itself I don't know, switched the screen in top mode - and Calibre resized the ePub edit window accordingly.

However, after restoring the wide mode, I noticed the file browser is 1cm wide, similar for the preview while the actual editor occupied the bulk of the screen.
It appears that sometimes Calibre "saves" the positions/sizes, but most of the times it doesn't, and even if it saved once the next reopening reverts back to 1cm wide file broswer and stuff.

I cannot find any solution in the forum (searched with google inside), only info that refer to the parent window/s.

Is there any "locking-in-place" solution for the delimiters?

Thanks