Unable to start MSFS due to warning pop up

Hi All,
Whan ever i start MSFS i get a warning pop up. It warns me not to create stuff due to a bug they are working to resolve. My problem is that the warning pop up cannot be closed and no part of the sim is responsive. The only course of action is to force kill the whole sim in task manger.
Does this happen to anyone else ? Any ideas as to how to resolve this so that i can use the sim ?

/Carl

Make sure you are in full screen (alt+enter, no windows borders)
You render scale is 100%
Your sim resolution is the same of your Windows resolution

More on that

https://devsupport.flightsimulator.com/questions/12399/i-cant-close-this-devmode-message-when-i-launch-my.html

Thank you all who pitched in and helped !

The issue is now solved for me. Alt+enter to go to full sceen mode.
Happy skies,
Carl