While I appreciate having access to Grammarly across many of my apps, I don’t always need to be checking my spelling and grammar.
I created a simple Keyboard Maestro macro (tied to ⌥⇧⌘G) that toggles Grammarly. This way I can easily fire up Grammarly when I need its services and shut it down if it’s getting in the way or is not needed. This macro also automatically closes the window that is displayed when Grammarly launches.