There are a few ways to screenshot on the Samsung Galaxy S20. The first way is to use the screenshot tool that is built into the phone. To do this, open the app and select the screenshot option. Then, take a picture of what you want to screenshot and save it to your phone. The second way is to use a third-party app. There are many apps that can be used for this purpose, but some of our favorites include Snapseed and Camera+.