Whilst previewing, I never remember whether a theme is VC or not.
When you are on the search page, you can filter WPBakery Page Builder compatible themes in the left panel under “Compatible With” section.
Yeh, but if I’m not because I want to see all and your main selling point is a specific builder, then I don’t know that in preview…
What do you mean by “because I want to see all”? You can see all themes which officially support WPBakery via search page, like this