Big Sur - New/Open/Save dialog box -size won't resize horizontally

Yes, it happens under that mode. Also, that one takes have and under new user acc. But I noticed that this problem only happens with "lazarus" applications. Like here - https://forum.lazarus.freepascal.org/index.php/topic,52212.0.html .

With standard applications I don't have a such problem.

But there is one caveat - The problem appeared from the moment, when I left from Mac OS Catalina to Big Sur one.

Program developers need to recompile that lazarus' app with with profile xyz. The app name is 3D LUT Creator https://3dlutcreator.com/

They are unlikely to do it.

So as "workaround" I have to run it with reset Finder' prefs.

defaults delete -app LutCreatorMac NSNavPanelExpandedSizeForOpenMode

defaults delete -app LutCreatorMac NSNavPanelExpandedSizeForSaveMode

open -a LutCreatorMac

So I wrote about my OS version.

A similar problem: https://forum.lazarus.freepascal.org/index.php/topic,52212.0.html