Hello,
I regret any confusion, but Twentig does not provide the ability to add a sidebar in the Twenty Twenty and Twenty Twenty-Two themes. However, for the Twenty Twenty-One theme, the Twentig plugin does indeed have an option to add a sidebar.
In the case of the Twenty Twenty-Two theme, it has been built with the Full Site Editing (FSE) feature, which means you can create and modify templates for any area of your website including sidebars using the site editor (Appearance > Editor > Templates). There you can edit the template of your choice and add a sidebar by adding a Columns Block.
Hope that helps,
Yann
