The Events Calendar’s Gutenberg block editor experience is very nice! The problem is that when creating a Beaver Themer singular layout, Themer’s modules (Post Content / Event Description) include every Gutenberg block from the editor. This is NOT ideal if you want to have full control over the layout.
To JUST get the description text, you have to use the [tribe_event_inline] shortcode (Requires The Events Calendar PRO):
[tribe_event_inline id="[wpbb post:id]"]