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NOTE: Do be cautious making any edits to your registry! Errors can make your computer need to be reset, cause data loss or become unusable!!!

MBZ1_ 

Solved!
The registry editor does resolve this issue.

For those who do not know how to do this, here are the steps:

1. Step one: It is very important that a registry backup be made and only desired changes be made to the registry.
   • If you are unsure how to do a backup, search online how to do this (I use Google).
2. Step two: close Outlook:
   • Note: Ensure all important emails/drafts are saved before closing Outlook.
   • Hold the "Ctrl+Alt+Delete" keys and select "Task Manager". Then, in the pop-up box select Microsoft Outlook and click on "End Task".
3. Step three: in your Windows Operating System (OS) taskbar search box type "Registry Editor".
4. Step four: Click on the Registry Editor (App) icon to open.
5. Step five: in the left column of the Registry Editor window, you should see a folder hierarchy. You will need to click through the folders to find the correct one (which will open on the right). Follow this folder path:
   •  HKEY_CURRENT_USER > Software > Microsoft > Office > 16.0 > Common > ExperimentEcs > Overrides
     • How to navigate through folders: Each ">" symbol above represents a transition into a sub-folder. Each sub-folder can be navigated to by double-clicking the folder icon or single-clicking the ">" expand icon.
6. Step six: When you have navigated to the "Overrides" folder, look in the right-hand column to determine whether there is a key called: "Microsoft.Office.Outlook.Hub.HubBar".
   • If yes: then right click on the key, select "Modify...", In the "Value Data:" field, replace whatever is there with the single word "false" (do not include quotes).
     • Note: You may want to remember the exact value that was there in case you ever want to revert this.
   • If no: If the "Microsoft.Office.Outlook.Hub.HubBar" key does not exist in this folder, you can easily create it by right-clicking on an empty space in the right-hand column, hovering over "New  > " in the pop-up selector, and clicking on "String Value". Then, simply type or copy and paste: "Microsoft.Office.Outlook.Hub.HubBar" into the key naming box (without quotes).
     • To save your new key: click any blank area in the right side of the Registry Editor and outside the key naming box.
     • After you have created the new key, right click on the key and select "Modify...". In the "Value Data:" field, replace whatever is there with the single word "false" (do not include quotes).
7. Step seven: close the Registry Editor application by clicking the "X" in the top-right corner.
8. Step eight: This is the fun part! Restart Outlook with no pesky left-sidebar navigation pane!!!
9. Step nine: share this solution with someone who needs help! 🙂

NOTE: Do be cautious making any edits to your registry! Errors can make your computer need to be reset, cause data loss or become unusable!!!