I'm afraid you'll need to provide a bit more information than this. Please fill out the template so we can see exactly how you set things up, what versions of things you're using, etc.

By "not memorized, you mean they don't remember their sizes when closed and re-opened?

Moving to KWin | wayland-generic for now.

(In reply to alexjp.lenertz from comment #0)
> SUMMARY
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> STEPS TO REPRODUCE
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> OBSERVED RESULT
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> EXPECTED RESULT
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> SOFTWARE/OS VERSIONS
> Windows: 
> macOS: 
> Linux/KDE Plasma: 
> (available in About System)
> KDE Plasma Version:5.19.5 
> KDE Frameworks Version:5.73.0 
> Qt Version:5.15.0 
> 
> ADDITIONAL INFORMATION

When I change the size of a window in Plasma-Wayland-Session,when I close it and reopened it again the window doesn't save the chosen size.It returns to its initial state before resizing.Try it yourself when using Plasma Wayland Session.

Thanks. I think this needs to be implemented at the compositor level on Wayland.

It seems now that the windows in plasma-wayland-session remember their size.Qt-apps,snaps,flatpaks,appimages seem to save the chosen window size.I've noticed that yesterday,when playing around for a time with the resizing of windows.Most Gtk apps also remember it,except certain Gtk applications like,for instance,brasero,which refuse to get resized.Is it possible that this problem has been fixed recently? I think that Kwin was updated a week ago,as I remember.Is all that right?

Indeed, support for this went in recently IIRC.

Think of brasero and perhaps some other Gtk Apps.They still refuse to get resized,despite the fixing of this bug recently.

They're GTK apps; that's up to them. We cannot do it for them. You'll need to contact their developers.

Since one of the last updates I saw that Brasero can now also be resized in Wayland-Session.So,this bug is at last really RESOLVED and FIXED.