Try a different theme, then desktop manager/compositor or desktop. Esp maybe one not using Wayland.
Using Calibre here on Linux Mint since version 18.x and now on 21.2 with Mate desktop. I've had one or two themes with odd popup style. I currently use an MS Server 2003 style for "controls", a Windows XP Metallic for Window border/decoration and Oxygen Icon set. But currently I think all themes work and all Window Managers / Compositing work, though some lack transparency to see destination when doing drag & drop (move or copy).
I'd expect some other programs (maybe only if using same QT) to have the same pop-up bug.
|