Thanks a lot for playing and die the feedback! ๐
The "grab a chair" part is primarily there to make you aware that you can also leave the chair and run around without (there are some Easter eggs that you can activate on each track). It should also be a funny little "rumble for the chairs" before the actual race starts ๐
And no, you get the chair you choose before the race. That's why you see all chairs shuffling through when there's no one sitting on them.
And I got a question regarding the window mode: how did you set the full screen? Through the bottom right overlay button (when playing the browser version) or the in-game button in the title menu? I will have a look into that. Thx for making me aware of this bug.