After plugin activation, Under Appearance > Widgets all the available widget will have extended options at the bottom.
Assign column display on each widget for every device! You can set up to four columns which is available for desktop, tablet and/or mobile devices.
Columns - Select up to four(4) columns for each devices for Desktop, Tablet and mobile.
Clearfix - CSS Floating depends on content size. If in any case the column floating for each devices display weird, use check clearfix to break the floating.