As Outlook safe works, disable the add-ins following steps mentioned below and check if it helps:
a) Click on File menu, click Options > Add-ins > Go button besides Manage: Com-in Add.
b) Check if there are add-ins listed, clear the checkbox.
c) Close the Office program and restart it.
d) Disable each add-in one at a time, restart the outlook, and repeat the above procedure. If the issue reappears again, it will help you to determine which add-in is causing this issue.
Also ensure that
‘Show desktop only on 1’option is selected.
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