LibreOffice scaling with mixed DPI on KDE

ffice is fine on the laptop screen. When I move it to the external monitor, the UI elements become gigantic - it's as if it's correcting the scaling the wrong way around. Mabye someone else has seen this and knows a fix like an environment var

Two UI glitches with Sylpheed on KDE

red circle with a diagonal stripe), even through functionally it's all good. Both of these I've noticed in other apps as well, but I don't remember where. Perhaps it's to do with the GTK versions these use. I'm using the Fedora KDE spin. Anyone else