In some applications the icons in the title bar are tiny. Fonts and height of the title bar match, but the buttons are really small. One of those applications is the software center (pamac). Here you can see it with at the right a window of Kate with correct scaling.
I also looked at this HiDPI - ArchWiki but I don´t seem to have the file ~/.Xresources I guess it has something to do with GTK, but the only issue is really the size of buttons/icons in the title bar. Fonts are fine, height of the title bar as well.
PS: I have not installed any additional themes or tinkered theme settings. So just using the standard ones that came with the installation.
You could start a GTK application to use its own scaling, for example:
env GDK_DPI_SCALE=1.50 pamac-tray-plasma
However, while it will scale the buttons and controls of Pamac, it will not affect the window controls, perhaps because this application uses CSD (client-side decorations).
For this to work with Pamac in particular, you must completely quit the application by right-clicking it in the tray. (Changes won’t take affect until Pamac’s next launch, and since it lives in the tray it must first be exited completely.)
Then either start pamac-tray-plasma with the above environment variable, or create/override its Exec= command in the respective .desktop / autostart file.
Thanks. I tried env GDK_DPI_SCALE=1.50 pamac-tray-plasma, but that has indeed not the desired effect. It makes the fonts larger and also the height of the titlebar. Both are already scaled as you would expect. The buttons in the titlebar remain as small as they were before.
You were also saying you need to learn to use KEYBOARD shortcuts - which is actually not correct (though you should be aware of them).
We click targets when we’re using a mouse - and I’m lazy to click targets.
With KDE we have custom shortcuts where you can set Mouse Gestures.
Make a new folder in there for ‘Windows’
Entries for ‘Close Tab’ as well as ‘Close’ and also ‘Kill’ is useful…
Close tab - gesture L - action ‘ctrl+w’
Close - gesture x (drawn like an alpha) - Alt+F4
Kill - gesture like a ‘k’ - meta+ctrl+esc (gives a skull cursor to kill an app).