If the block is docked, and you click on the "Add favorite" button without undocking it then no window appears. If you undock the block it works perfectly. We are using Moodle 3.6.3 with the "More" theme and this was observed to be the same on both PC and Apple on multiple browsers - firefox, chrome and safari. We do have quite a bit of CSS on the site, so it is possible that the issue is to do with that.
If the block is docked, and you click on the "Add favorite" button without undocking it then no window appears. If you undock the block it works perfectly. We are using Moodle 3.6.3 with the "More" theme and this was observed to be the same on both PC and Apple on multiple browsers - firefox, chrome and safari. We do have quite a bit of CSS on the site, so it is possible that the issue is to do with that.