Toggle back from Full Screen Mode and Return to Windown Mode

I pressed the toggle to full screen button in your app from the menu at the top, after the installation. Now after that I am not able to return to normal mode i.e. window mode. I tried uninstalling it and installing again, but it's still opening on full screen mode and I cannot return to normal. Can you pls help me out with this issue?

My OS is Linux Mint Cinnamon 20. 