My Tumbleweed is up to date, using Wayland. My TV-monitor offers 4160 x 2160 screen size, but horizontal windows and panels run past the edge unless I change to 3840 x 2160 (a 16:9 ratio). I also set a 130% scale for readability.
Windows and and panels which I can control by rules (including ‘kcm_kwinrules’ itself ) are easy set up with initial sizes. But generic pop-ups (notifications and control when clicked) are too tall and too wide, I am unable to use the panel to close them from the desktop on which they came up.
The “Notifications” control panel offers only placement (at corners or middles of edges, with no GUI to set either initial pop-up size or ‘maximum values’ for width and height. In order to close a pop-up, I need to change desktops and then use the panel “close pop-up” control from that other panel. Not difficult (for me), but kinda nasty for anyone who can’t figure out that workround. Maybe impossible for a workspace with only a single destop or non-configured switcher tools). Any hints before I open a bug?