@AndreasW In the meantime, after researching @George Hofmeister excellent feedback, have you thought of using a laptop, and controlling the YT app from there, and using the Windows 10 "project screen" functionality? It won't be ideal, but hopefully more controllable and less buggy that on the TV directly.
NOTE: I have had feedback that users need to update the Windows 10 OS to the latest feature Upgrade (that is 20H2 that some call the "October Update"), as it will make the Screen Mirroring (Project Screen) work better for more TV types. The name 20H2 means the update for "second half of 2020" as they went away from YYYYMM naming strings, as the release time-frame could not always be done in the month intended. If your device or country/area cannot get that update yet, update to the older "2004" May update and try the Project Screen,, Failing that, try using an HDMI cable connection, if your PC/Laptop device has an HDMI socket.