You can check all Google Docs, Sheets, and Slides where you have editor rights.
If you're working with a shared document, make sure that you have Editor access. Acrolinx won't work if you have Commenter or Viewer access.
Acrolinx doesn't work consistently in the Suggesting mode in Google Docs. This is because Acrolinx can’t tell the difference between content from a previous revision and content from change suggestions. To check your content, switch to Editing mode.
To use add-ons like Acrolinx with Office files in Google Workspace, convert these files into Google Docs, Sheets, or Slides.