Task bar moved from bottom of screen to the side of screen (I can not figure out how to fix this)

In the top right of the screen, you can turn off Coming Soon to get the navigation bar back to the bottom.

The new left rail that you are seeing will be the default soon so if you can make it work, please try and use it in the new location. This article explains the direction and rationale, New location for key functions and direct access to other Microsoft 365 apps in Outlook (office.com).

I use a monitor in at 90 degrees in portrait mode for my outlook. This change of a couple of nested buttons at the bottom to using an entire vertical bar thus crunching my already limited From, Subject, Received fields is not a welcome addition. It's a waste of my monitor space. Please make this change a one that can be reverted back to normal.

Why have you changed it???? Yet another change for the sake of change - dont you idiots understand that every time you change things irts takes time to find and use them - this impacts on time and therefore money????? LEAVE THINGS ALONE

If Microsoft can inflict Windows 11 on its customers, it's unlikely they are going to listen to those of use who are annoyed by this. There is, however, a fix, as described by Tim Pi on page 4 of this discussion:

Create a text key in the registry (back it up first!):

Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\ExperimentEcs\Overrides\Microsoft.Office.Outlook.Hub.HubBar and set its value to False.

Restart Outlook and all should be well (for now).

The relocation of the task bar in "oulook" is a very bad move.

The dilusional individual that thought of this move, should have consulted