In this article, you will learn how to check in all the checked out documents in your sites before a migration.
How-To
Select All reports from the sidebar.
Select the Checked out documents report card.
Run the report.
Select the desired documents from the results.
Select Check in from the Quick actions.
Select if you want your documents to be checked in as major or minor versions.
Click Check in.
All your selected documents will now be checked in.