Source: https://intellij-support.jetbrains.com/hc/en-us/community/posts/360004366159/comments/360001082099
Yes, you can disable that:
- open Help -> Edit Custom VM Options...
- add a string -Dide.win.frame.decoration=false
- restart IDE
Source: https://intellij-support.jetbrains.com/hc/en-us/community/posts/360004366159/comments/360001082099
Yes, you can disable that: