I am doing with some derived parts. I need help on the followings:

Q1: Derived part - What does this "-" sign indicate?

Q2: Although some sketches turned off, they all look similar despite some are hidden. How can I get the hidden sketches greyed?

Q3: I renamed this in the master sketch. Not updated here. How can I get browser name updated in here?

Note: Q3 is OK. I get the browser names updated by selecting the derived part icon in the browser and running Edit Feature.