How do I change the system tray gadget?

I can not seem to edit the system tray... setting/extensions/gadgets seems to be were I can turn on or off the system tray as well as add things like battery and clock and stuff... but I can not seem to edit the icons in the system tray,

I have installed some apps that apear on the tray, but I want to either remove them, so I can not see them, or put them in a pop out tray like when you hide icons in windows 10... is there a function like that?

Yeah, looking to how I can hide icons form the system tray on th bottom right, preferably with a popout like in windows, but hidden if only option.