Deleting all highlight boxes in a project....

[#1]

I use version 2019: Is there a way to delete all highlight boxes in a project without deleting each individual boxes on each slide? thanks

[#2]

Is there a way to do a mass deletion of all highlight boxes in a project without having to delete each box by opening each slide?  If not, the lack of this option is really going to slow my progress on project reviews.

[#3]

No way to deleete all highlight boxes. I may have a workaround, if you really want to have them all disappear?  Make one highlight box invisible by setting the Alpha for the Fill to 0 and the Stroke width to 0 as well. That will override the default style (s+ sign is added). Hse the hamburger menu and choose the option 'Save Changes to existing Style'. All highlight boxes will become invisible....at least if they used that default style.