This is the footer area where you can put copyright information along with widgets, menus etc. You can choose a layout for the small footer bar under Appearance > Customize > Layout > Footer > Footer Bar
FOOTER BAR LAYOUT
provides two layouts for footer bar.
Footer bar layout two
SECTION 1 AND SECTION 2
Read more about Custom Text Helper Strings from here.
It will allow you to add a widget to footer sections.
FOOTER BAR WIDTH
This allows you set footer content width either to full width or to content width. You can choose options from drop down. Footer bar background will be set to full width by default just the content width will change.
FOOTER BAR TOP BORDER
You can set a top border width for footer bar and its color with this options.
Related documents –
Colors/Background and Typography options for Footer Bar