Astra offers 4 widget layout for the footer.
Setting are available under Appearance > Customize > Layout > Footer > Footer Widgets
Once you select the 4 widget layout for the footer, you can set the widgets for each area under Appearance > Customize >Widgets > Footer Widget Area 1/2/3/4.
COLORS & BACKGROUND FOR FOOTER WIDGET AREA
You can set colors for Widget Title, Text and link in the footer under Appearance > Customize > Colors & Background > Footer Widgets
TYPOGRAPHY FOR FOOTER WIDGET AREA
Typography options set under Appearance > Customize > Typography > Base Typography will be applied to the footer widget area by default.