When you have chosen for managers to go last, your goal is for all reviews to be submitted before the manager writes and finalizes their manager review. However, there will likely be times where a slow reviewer is holding up the manager. In those situations, admins have the ability to "unlock" the manager review for an employee or all employees. To do this:
Step 1: Navigate to the "Admin" panel found in the top navigation bar
Step 2: Click on "Reviews" found in the left Administration panel
Step 3: Find the appropriate review cycle and click into it
From here, you can either, A) click "Allow Managers to Submit" to allow ALL "Locked" managers to start submitting their reviews.
Or, B) you can allow a specific manager to submit their review.
To open a review for a specific manager, find the name of their direct report (the review in question) and click on the ellipsis (...) to the right of their name. Then, click "Allow manager to write their review."
This will email the manager and let them know they can submit their review.
Please note: this does not lock out the other reviewers that have not submitted their reviews yet. This just gives managers the ability to submit their reviews right away (without having to wait for their direct reports to receive others about them).