Unable to change freehand highlight back to text highlight in M365 copilot app on iPad

On iPad, using M365 copilot app. (Editing files previously saved using OneDrive, but not editing in OneDrive).

In M365 copilot app, I click on Files, choose a file to add annotations, click the pen top right for annotations.

Previously I was able to select highlight option and then select text, and only that text would highlight. At some stage I was able to change that option to freehand highlight.

Now it is stuck on freehand highlight and won’t allow me to return to normal text highlight ( apart from the “highlight” option which is always yellow.

I can’t seem to find a settings option or other change annotations options.

PLEASE HELP