First please navigate to Appearance > Customize > Footer > General > Display Footer Content From and select “Sidebar”
Next you have to setup footer sidebar columns option from Appearance > Customize > Footer > General > Footer Sidebar Columns.
Footer Widgets
Once you setup footer sidebar columns option from above instruction. Now you can add widgets to “Footer Sidebar” via Appearance > Widgets. Simply drag widget you want to add on the left side and drop on “Footer Sidebar” area.