The sidebar is a WordPress widget area (like the footer) which means that you can add any number of WP widgets there - these are different from Elementor widgets.
To select which widgets show in the sidebar, you can manage the content in either of two places:
1. Under Appearance > Widgets (backend view)
2. Under Appearance > Customize > Widgets (live frontend view)
The widget area for the main sidebar is titled "Primary".
There are four widgets specific to our themes which are mainly designed for the footer, but can also be used in the sidebar: Contact Info, Social Icons, Payments Accepted, Footer Logo.
You can edit the content for any of these widgets under: Appearance > Customize > Theme Options > Footer. *
* If you are using the Bellevue or Uplands theme, this is located under Appearance > Customize > Theme Options > Widgets
If you have any questions, please feel free to open a ticket.