I have bought the medical theme for WordPress by Envato. http://themo.net/health/#our_team
I have thought I could use Visual Tool - WPBakery Page Builder to change the main page of the theme. But it is impossible. What I can do is only look for code and change it. I feel a little bit confused.
Could you explain me what maybe I do incorrect?
Excuse me if I picked wrong part of forum.
your purchased theme included WPBakery Page Builder as a plugin bundle. So, you can use that plugin but as far I have checked your theme is not wordpress 5 ready. So may be wordpress 5 default block editor not compatible with your theme. In that case you can use/install classic editor. clasic editor is free and you can download/install easily from wordpress dot org.
Still facing problem then the best way to get the support is Contact your purchased Theme Author. Contact Author and let them know your concern.