Highend WP theme options menu not working

Hi There,
In addition to the Highend WP theme options menu not working, the WPBakery backend editor is also malfunctioning, and it’s not possible to update pages. The “Preview Changes” button is not working and the “Update” button goes to the preview page instead!

WordPress: 6.0.1
Highend: Version: 1.0.1 child theme of Version: 3.3.9 (note I can’t update the theme because it has been renamed, and the updated theme doesn’t get active.
WPBakery Page Builder: 6.9