I FOUND A SOLUTION!!! This is not mine but I have tried it and it worked for me. I do not have admin on my work system and it still worked. I have not rebooted yet to see if it will persist without admin.
The site I found the solution on is: https://www.extendoffice.com/documents/outlook/7190-outlook-move-navigation-bar-left-to-bottom.html
If this removes the link or you don't want to go, here is the short steps summary:
1) Open Regedit
2) Navigate to Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentEcs\Overrides
3) If the string "Microsoft.Office.Outlook.Hub.HubBar"does not exist, create it by right clicking on Overrides in the left pane and selecting New->String Value
4) Paste "Microsoft.Office.Outlook.Hub.HubBar" in the new entry that appears in the right pane
5) Double-click the new name
6) Enter "False" in the Value data field.
7) Click OK
8) Close and restart Outlook
9) Voilà (pop culture reference, "which is short for, and then I found out")