On iPadOS 14, what does this box on the today view do?
Widgets placed in the ‘favourites’ section remain on the home screen when other widgets below are hidden.
To see the difference between the widget sections, place a widget in the favourite section, tap Done, then scroll the list of widgets beyond the top to push the bottom widgets off screen. Let go and the bottom widgets will remain hidden while favourite widgets will remain. Scroll the list down to show the other widgets again.