Set File Picker to use KDEs Dolphin Rather then GTK:
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1. Install packages xdg-desktop-portal xdg-desktop-portal-kde .

2. Edit the /etc/environment file, add this line:
GTK_USE_PORTAL=1

Save the file and reboot!

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Source: https://babarowski.com/blog/change-gtk-file-picker-to-kde-dolphin/
Date: Spring 2024