Flutterflow web app - how do you handle different screen sizes (height/width pixels)?

Hello, I am creating a web app. I have set it up on Flutterflow as 1920x1080p. I am wondering, is there a way to make the web app to work on different screen sizes (e.g. 1440×900, 1024×768 etc.)? How do you handle this in your web apps?