In Post Ads - unable to "un-select" custom post type

Hi there.

I selected a custom post type (in my case "video"). I decided that I do not want it, but I am unable to "un-select" the custom post type - How to I go back to having no custom posts types selected? (I can only go back and forth between the custom post types (i.e. video and pages) - there does not seem to be a "none" option.)

I've tried this in Chrome and Firefox but no luck?!?

Thanks!
Jennifer