TL;DR: Make sure you either:
a) completely update AirPro theme, like described in this FAQ article,
b) download the latest AirPro theme and update just two of the bundled commercial plugins: WPBakery Page Builder and Booked plugin; or
c) if you still have WPBakery Page Builder versions 5.5.5. or some other more recent release, open WPBakery settings and tick “Disable Gutenberg Editor”.
A little background:
First announced at the beginning of 2017, and after going through an intense period of development, the new editor (code-named “Gutenberg”) has finally arrived to WordPress core.
Starting from version 5.0, WordPress enforces the new editor as the default editor for posts, pages and other post types.
Bad news is: the new editor will break most of the page builders editing UI, because most of them partially relied on the old WP editor.
Example: Instead of looking like this, the edit form for a page will look like this.
So, since the internals of the new editor are not compatible with the existing page builders, a few updates were needed for most of the page builders out there, including WPBakery Page Builder.
Fortunately, after the latest plugin updates, the editing experience remains almost the same as before. For example, after opening a page for editing, the UI is showing two old familiar buttons (“Classic Mode” and “Frontend Editor”), with one additional button, “Gutenberg Editor”. It can be seen at this screenshot:
So, the editing process should be basically intact.
Note: This UI has been introduced with WPBakery Page Builder v5.6. For a few previous versions (v5.5.5. and it’s immediate predecessors) the buttons won’t be visible. However, even in this scenario it’s possible to revert to the old editing experience by going to WP admin -> WPBakery Page Builder -> General Settings, and ticking “Disable Gutenberg Editor”.