Point to note: Depending on your purchased theme, screenshots may vary.
By default, we're providing 'Blog' page (your-domain/blog) which is 'Posts Page' where all the posts can be displayed.
You can change layout for 'Blog' page from 'Theme Options > Blog > Blog Layout > Blog Style'.
Sidebar will be automatically placed on the right side for 'Default' blog style. For all other style, you can choose sidebar from 'Theme Options > Blog > Blog Layout > Blog Layout'.
As the layout of 'Blog' page (Posts Page) is coming through 'Theme Options', so you can't edit the 'Blog' page through 'WP Bakery Page Builder' or 'Elementor'.
If you mistakenly delete the 'Blog' page or you want any new page to be your 'Blog' page, then create that page first as blank (Don't add anything on content section) and assign that page as your 'Posts Page' by following our tutorial https://radiantthemes.zendesk.com/hc/en-us/articles/360042136694