I was following this thread when someone posted a solution on another thread for removing CoPilot banners and widgets that interfere with using Outlook webmail. It requires downloading the extension uBlock Origin which is easy to find using google.
I'm copying it here in case anyone is still looking for an answer. It may not work for everybody but it worked for me and was super easy. If it doesn't work, you can still compose emails from the Draft folder without the widget.
Here is a solution that worked for me to remove that copilot summary banner and to remove the 'try with copilot' when writing a draft.
Using Firefox and uBlock Origin -
- In uBlock settings select the 'My filters' tab.
- Add the following two lines -
- outlook.live.com##.vaN5Q.wekzh.r7GQl
- outlook.live.com##.fui-PopoverSurface