I may have your solution.
File-> Options-> Advanced
Uncheck "Show Apps in Outlook"
Restart Outlook
and bonus mine reverted the mail, calendar, people, tasks icons back to the bottom where they belong!
Good luck!
I am so happy that I found this post. I have logged 5 support requests trying to find a Microsoft support person that could help me restore the classic tasks to my Navigation pane and no one was able to help me. I started asking for assistance on May 18th, 2023. What has happened to the Microsoft Support for Office 365 Business??
I'm very happy to be able to continue to use the classic tasks, but I'm very concerned that it looks like Microsoft is retiring this functionality in favour of the new "To Do" functionality. Although the "To Do" functionality has some cool features of cross-application usage, the basic task management features are garbage!! I have currently have 86 active tasks that I use to track all of my interactions relating to the tasks. This can be accomplished very nicely in Tasks with the rich text features of the Notes area. From what I can tell, this is not supported with “To Do”. I will be very sad to see “Tasks” disappear and will need to look for another vendor’s task management solution.