well, @Egregius found something – and when you follow some links …
→ viziblr - News - The Windows and Wacom Tablet Nightmare is Over → UNCHECK ‘Windows Ink’
The Wacom driver settings don’t seem to be affected with the latest Windows update 21H1. 
Now, I still hope for a less ‘compressed’ user interface
– see screenshots in About Nik 4 - SilverEfex 3 & Viveza 3