The Responsive Selector allows you to select the screen size you want to work with when editing your designs in the Gutenberg editor.
3 screen sizes are available: Desktop, Tablet & Mobile.
When a specific screen size is selected, all modifications made to responsive properties will affect the selected screen size.
When editing Cwicly blocks, some settings are responsive and will change depending on the user's screen size.
If a block property has the selected device icon in front of it, this means it is responsive.