I tried this myself on both of my Windows 10 devices, and was not able to replicate the issue, so I was hoping to get a bit more information from you regarding the behavior you are seeing.
Has this always happened? Was there a recent Windows update that changed this behavior for you?
Does this happen in other areas of Roon? What about other applications?
In Settings > Setup do you have Enable On-Screen Keyboard active?
Since noticing this behavior, have you tried rebooting your PC?
Is this device your Core machine, or just a remote?
Can you please provide the exact make and model of the Windows 10 device you are using?
I’m passing along this information to the technical team to see what they can come up with in house. I’ll be sure to keep you updated on their investigation here.
In the meantime, can I ask that you please verify one thing for me? In Roon, under Settings > Setup do you have Enable On-Screen Keyboard active?