https://bugs.kde.org/show_bug.cgi?id=456585
--- Comment #10 from Edward Viesel <edward.vie...@bornepost.eu> --- A note in advance: I upgraded five computers to Kubuntu 22.04 and installed the Wayland package and tried to install Thunderbird themes. Result: (all computers have onboard graphics, no dedicated graphics card) - 3 computers installed the themes perfectly. - 1 computer (an old Intel notebook) installed the themes perfectly; however on opening Thunderbird, the main window is too big (i.e. the topmost panel with the „cross“ icon for closing the window is just outside the upper screen margin). If I pull the main window downward and click on the Maximise icon (diamond symbol; „Wiederherstellen“ in German), then the main window resizes correctly, and stays correct. - 1 computer (the Lenovo AMD notebook under discussion here) did not install the theme, as reported above. Now: I created a USB drive with KDE Neon with KDE Plasma 25. I started Neon (in X11 mode) and installed Thunderbird via apt-get. Then I copied a Thunderbird XPI file (theme) to the Neon session. I tried to install the theme (in X11 mode). Installation worked perfectly. No problem. I restarted the session as a Wayland session via an edit in /etc/sddm.conf. (https://zren.github.io/2020/08/09/testing-wayland-in-a-neon-livecd) Then I tried to install the theme as before. However, Thunderbird displayed the same behaviour as described in the first post above. I have noticed the following: The pop-up window with the „Add“ button (at the end of the theme installation process) is vertically aligned with a black jigsaw-piece symbol in the main window’s tabs panel. If theme installation works properly, the black jigsaw-piece symbol and the pop-up window are vertically aligned (and "docked") along the RIGHT-HAND margin of the „Add“ pop-up window. So the pop-up window is always „in“ the main window. With the problem under discussion here, the alignment of black jigsaw-piece symbol and pop-up window is along the LEFT-HAND margin of the „Add“ pop-up window, it is „docked“ in this position. So it is only logical that most of it is „outside“ the main window., if the windows fills the screen completely. This might mean that the cursor is always solely ready for „resizing“ and not for „activating buttons“. I am attaching a screenshot of the final problem situation. You can also see the basic specs of the computer and the KDE Neon session via the Info Center window I had started. -- You are receiving this mail because: You are watching all bug changes.