First of all, still running on X11 because bko#377162, sorry! With earlier kmail versions, the composer windows managed its own geometries, e.g. creating a new mail used the window size and position of the last composer window. With 24.02.2, this behaviour is lost, and kmail main window geometries are mixed up with composer window geometries: a new composer window inherits the main window size. In my setup, I'm running kmail main window vertically expanded on a huge 30" screen (since ages). But now, new composer windows are drawn with the same size. Before, it maintained the composer window geometries independently of the main window, and appeared a lot smaller in my setup. Another indication of this new behaviour and the mix-up is reproduced like this: Start up kmail. Resize vertical size to take the full screen height (up to the control panel, of course). Open a new mail. Resize the composer window to a different size, say half of the main window. Close the main window. Close the composer window. Restart kmail, et voilà, the main window appears with the size of the last composer window. This is a regression from my point of view. The kmail main and composer windows should manage their geometries independently. The new behaviour looks and feels ugly, as well as usability is awkward. Also, semantically, main and composer windows act quite different semantically, hence their geometries should be managed separately as well. Operating System: openSUSE Tumbleweed 20240429 KDE Plasma Version: 6.0.4 KDE Frameworks Version: 6.1.0 Qt Version: 6.7.0 Kernel Version: 6.8.7-7-preempt (64-bit) Graphics Platform: X11 Processors: 24 × AMD Ryzen 9 3900X 12-Core Processor Memory: 62.4 GiB of RAM Graphics Processor: NVIDIA GeForce RTX 3060/PCIe/SSE2 Manufacturer: ASUS kmail 24.02.2