I work on design systems in Figma and have done for a few companies.
It would be really useful to have the split-screen mode that you see in coding editors like VS Code. If you are trying to align components it is really useful to have them open next to you. I’ve sometimes worked around this having desktop and web views open side by side on the screen.
My thought would be that the left and right panels update to match the window you are focused on.
Rough Mockup: https://ibb.co/zVWpPgJ