Astra offers 4 widget layout for the footer.
Settings are available under Appearance > Customize > 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.
You can choose WordPress default widgets or can add a third-party plugin to add widgets in the list.
Colors & Background for Footer Widget Area
You can set colors for Widget Title, Text and link in the footer under Appearance > Customize > Footer > Footer Widgets
Note: The above colors will be applied to default WordPress widgets only. If you are using a third-party plugin to add widgets, you would need to manage colors from the plugin itself.
Typography for Footer Widget Area
Typography options set under Appearance > Customize > Global > Typography > Base Typography will be applied to the footer widget area by default.
More options will be available with Footer Widgets Module with Astra Pro.