ParaView 5.8.0-RC3 and Master: RenderView and GUI Scaling Issues with Qt 5.14.1
As can be seen on the screenshots, the RenderView is grayed out with Qt 5.14.1 running on both the Intel and the NVidia GPU.
The scaling issue is a little harder to see. Even though the icons and text are scaled more evenly, the overall scaling ignores my system scaling settings making everything a lot larger than it should be. I've read that Qt 5.14 introduced some improvements for HiDPI displays which might be related to the scaling problem.
The superbuild configuration was a default one only enabling Qt, using the system Qt in one case. However, this is not limited to the superbuild. I get the same behavior using ParaView master.
This was run on an Archlinux system running both an Intel and a NVidia GPU with 4K displays.