I was trying to type in the search bar but since sometimes it doesn't quite detect the click because maybe the box is thinner than I might perceive I must've pressed some key and now the interface is stuck in full screen and I have to alt tab to change windows. Clicking on the arrows button doesn't take me back, it seems to briefly go back to normal and quickly back to full screen.
This is a known issue that can occur with fullscreen mode sometimes. It is currently being looked into with a fix being worked on for a future update.
In the meantime, if you delete the Config folder at C:\Users\%USERNAME%\Documents\Twinmotion2022.2\Config then the issue should resolve itself the next time you launch Twinmotion.