3 unknown windows related to "language tool for desktop" when doing alt tab

Hello, I use altTab on macOS and I have observed that from last few dates, these three tabs from LanguageTool for desktop keep popping up. I am not sure what they are.
Do you have any Idea how to get rid of them?

It’s actually 3 windows saying – LanguageTool Underlying Overlay. I am not certain how to get rid of it.