The footer is made of section settings and  [2] customizable blocks:

Section Settings:

• menu / link_list
• title  / text

2.Store Details block

• logo / image_picker
• title / text

There is a limit of 1 block for the Store details and limit of 3 blocks for the Navigation 

There is a settings for the overall footer section where you can specide the number of the columns in the footer