One of the KDE Plasma features I use almost in daily basis is the MouseMark.
Go to your settings, in Desktop Effects, Enable the MouseMark (you can change the settings of it in the button in front of it). Then press Meta+Shift and move your mouse to doodle, or press and release Meta+Shift+Ctrl to define beginning and end of an arrow (it will draw the rest.
Interestingly enough, it have been in Plasma for the past 16 years:
https://github.com/KDE/kde-workspace/tree/master/kwin/effects/mousemark
@Mehrad @kde@lemmy.kde.social @kde@floss.social On my Desktop computer, running Arch Linux with Plasma 6.0.0, it works correctly. On my laptop with Fedora 39 and Plasma 5.27.10, it is bugged and doesn’t work properly (Both running under Wayland).
Anyway, a great feature! Thank you very much for pointing it out.