How to move pieces freely and come back to "before" you tried hypothetical moves in the analysis

Hello,
looking at GothamChess' videos, I can often see him move pieces around, and then suddenly come back to the original position before he started making hypothetical moves, then just keeps going like nothing happened.

How does he do that? When I try to analyze and go into an hypothetical line, I have to go backwards X amount of moves (being the amount of hypothetical moves I've made) before I can continue. Am I missing a shortcut?

Also, I was wondering if there's a way to use the board freely, meaning you don't have to do the black/white/black/white alternation, but instead just place the pieces wherever you want?

I can't find anything online about a list of shortcuts or something and have tried a lot of stuff already.

Thank you!