Here's how to setup a scrollview using Xcode 11
1 - Add scrollview and set top,bottom,leading and trailing constraints
2 - Add a Content View to the scrollview, drag a connection to the Content Layout Guide and select Leading, Top, Bottom and Trailing. Make sure to set its' values to 0 or the constants you want.
3 - Drag from the Content View to the Frame Layout Guide and select Equal Widths
4 - Set a height constraint constant to the Content View