This feature enables you to define access time restriction for the user account. You can define the restriction globally or for each day independently.
When you enable this option, you must add some rules for access time, otherwise this user will be banned.

Enable access schedule
Activate or deactivate the restriction.
Add Access Schedule
Add "Access Time Schedule" for this user. This user can log in at your specified time.
Edit
Edit your "Time Schedule"
Delete
Delete the selected "Time Schedule"
Delete All
Delete all "Time Schedule". This user can never log in again unless you disable "Access Time Schedule".