How do I modify a skin's sidebar and context menu?

[ElJoaZ]

Hi, sorry if this is a silly question, but I'm a bit lost trying to edit a pre-made skin by simply moving things around for personal preference.

 I wanted to customize and modify the player's sidebar where the playlists, favorites, queue are located. But I can't find it in the skin editor. I'm having the same problem with the three-dot icon where the options to view file information, add it to the queue, and more are located.

If anyone could help me, I would greatly appreciate it.

[Artem]

Refer to main.navigator tab