I've ran into the issue with Cubase 11 (11.0.10 as well) Pro and the latest version (Dec 8, 2020) of VST3 FabFilter plugins on Win 10.
The plugin window shrinks in size when it is closed and opened again with the "E" button on a plugin name.
I've tested Pro-Q3, Pro-C2 and Pro-L2, they all behave like that.
I thought this might be fixed by enabling "Allow window to be resized" option in Cubase, but it's not present for FabFilter plugins.
Here are my settings:
- Cubase has HiDPI mode turned on.
- I have two displays in use, 1440p and 1080p, each with 125% scaling set in Windows settings.
- In Windows compatibility DPI settings for Cubase I've set Scaling is performed by Application, otherwise the text in Cubase 11 is displayed blurry.
Here's the video with the demonstration of the issue and with all the DPI related settings: i.imgur.com/4cNfjdb.mp4
This doesn't happen with Cubase 10 (I have it installed in parallel) with the exact same settings.