Solution to the sidebar panel design

[Alberto]

I do some mockups for this sidebar (please, see the general idea, not only the shape of thing)

https://devtalk.blender.org/uploads/default/original/3X/b/8/b88c1dc5a7de782df615dee9edd8bac66fb1781e.jpeg

https://devtalk.blender.org/uploads/default/original/3X/0/a/0a079d230ba7d7b96c7d07c1883d6a626ad14091.jpeg

https://devtalk.blender.org/uploads/default/original/3X/c/2/c2b96a943fc03bc21aeafaf62ead0c330dad0980.jpeg

And some people add other alternatives to the base idea

https://devtalk.blender.org/uploads/default/original/3X/3/f/3f9c0688d7ffd27cd6f2570549d2a674e48eb612.png