9,832 questions
I found a solution:
- Switch to the Old Outlook UI
- Follow step 1 from this page: https://support.microsoft.com/en-us/office/turn-an-add-in-off-for-outlook-for-windows-96737da4-ab7c-464e-9d2a-cf15db47c4cf
- it will open Outlook Web, in an Add-in management screen your browser
- Then click My add-ins on the left, then in the Custom Add-ins you'll have a "..." button where you can remove each one of them.