Any system can be moved to and from favorites. There are 4 favorites. A,B,C,D. Each favorite can have good, very good, and excellent.
Selecting No will remove a group of systems from favorites.
This is normally done to select systems you like from the unique systems list. In GSB 50.20 onwards this can optionally be done by macros, if a system meets a certain criteria.
Note, multiple systems can be added into favorites all at once.
To select multiple systems, control a will select all systems (when you are on the unique systems tab)
You can do control, click - to select one system at a time. You can also do shift click to select all systems between two points.
Often you may want to sort the unique systems by a certain metric before you add them to favorites. ie np/dd (Net profit / draw-down)