Please add user-configured filter options to the List page

Thanks for sharing your feedback with us, @anon29114423! As it stands, sorting by custom fields is not available in My Tasks. We already have two threads on this topics, you can upvote here:

I also recommend you checking this tip ā†’ šŸ“¢ Tip on how to organize your work in a variety of ways (My Tasks Filtering Workaround)

I hope this helps!