I am designing a huge mega menu for a software application. In the menu bar, it is grouped by different tasks based on categories. At times, a user will have a need to click and open up more than one application at a time and will want to do so within the same session. The menu is designed to stay open until user clicks off the menu. While a user is opening all their necessary applications, what would be a good visual cue to signify to users that the application has already loaded and does not need to be clicked again open?
The selected applications will be open in the background, but the menu takes up a chunk of screen size so it is a bit hidden in the back.