Earlier this year, Google began rolling out a Quick Access panel in Google Docs to a limited scope of G Suite customers. Functioning similar to the Quick Access panel in Google Drive, except being located in the Explorer button, Docs uses artificial intelligence to to show relevant files in the Explorer button of Docs based on your Google Drive activity and information in your document. Now Google is rolling it out to all G Suite customers. While the feature is still rolling out, once you have it, you will have a richer experience on the Explorer button in Google Docs