I have a problem with the system menu.
The height of the tooltips are very small. So much that I can hardly read anything.

I have no idea how to add an image here. I have also post a topic in Manjaro's forum. I have added an image there.
https://forum.manjaro.org/t/plasma-menu-tooltip-height/73522

My system: (What I think can be important …)
Nvidia Graphics
Manjaro x64 Plasma KDE 5.14.5 updated
Workspace Theme: Oxygen
Desktop Theme: Air
Icons: Oxygen
Fonts: Ubuntu
Fonts DPI: Default
Resolution: 3840 x 2160
Scale Display: 1.0

I have tried changing almost everything.
Any idea?
Thanks in advance!

This is a known regression since a Qt update, see https://bugs.kde.org/show_bug.cgi?id=401842