Click the Grammarly icon in your browser toolbar and ensure "Check for writing suggestions on Google Docs" is enabled.
A small Grammarly icon will appear in the bottom right of your Google Doc. Click it to open a detailed sidebar of all issues. grammarly - Google Docs
Helps generate drafts, rephrase paragraphs, and overcome writer's block. Click the Grammarly icon in your browser toolbar
A specialized feature for students that tracks writing progress and authenticity. How to Enable and Use grammarly - Google Docs
Automatically underlines mistakes and highlights areas for improvement as you type.