Following a recent upgrade to Mac OS Big Sur 11.0.1 on the mac and upgrade to 1.8.6 of Publisher.
When attempting to use an outline on an image using layer effects, the gradient colour stops cannot be selected properly. Unable to switch from one end to the other end of the gradient colour circles. Shutting down publisher then restarting sometimes works but only once or twice. In the image attached the left colour circle is active. unable to click on or select any of the other 2 circles.
I have since been able to continue by opening the document on another mac using version 1.8 and Catalina. I was able to select the gradient stops and change the colours. I installed V1.8.6 on the Catalina machine and that worked as well. I have retried the document on the original Mac and the problem no longer manifests itself. This could be a work around. The document was originally created from a template on Publisher V 1.8.6 MacOS Big Sur.