I'm a relatively new Linux user having just switched from Windows 22H2 over to Fedora 39 KDE Desktop spin several months ago. My chosen Graphics Platform is Wayland. My problem is, Calibre E-book Editor has the GUI option of undocking two sub-window panes (which I accidentally did while exploring the application) and I cannot figure out how to re-dock them within Wayland.

I tried switching to X11 to re-dock the undocked sub-windows, and even though I was successful in redocking the undocked sub-windows, they re-undock themselves after switching back to Wayland. I even tried double-clicking on the two sub-windows I wish to re-dock to the main Calibre E-book Editor window, but all that does is maximize the sub-window I double-clicked the title bar of.

STEPS TO REPRODUCE:
      1. From within ebook-editor (Calibre E-book Editor), click on the undock button at the docked window pane.
      2. Double-click undocked sub-window.

OBSERVED RESULT:
      Undocked sub-window fails to redock when the Graphics Platform is set to Wayland.

EXPECTED RESULT:
       Sub-window should redock to the main Calibre E-book Editor window when the Graphics Platform is set to Wayland.

As of this writing, my current system specs is as follows:

      Operating System: Fedora Linux 39
      KDE Plasma Version: 5.27.10
      KDE Frameworks Version: 5.113.0
      Qt Version: 5.15.12
      Kernel Version: 6.7.4-200.fc39.x86_64 (64-bit)
      Graphics Platform: Wayland
      Processors: 4 × Intel® Core™ i3-7100U CPU @ 2.40GHz
      Memory: 15.4 GiB of RAM
      Graphics Processor: Mesa Intel® HD Graphics 620

      Mesa version: 23.3.5