Hello,
If menu static block content was created using Elementor, you can use Elementor to edit it only . Go to Elementor > Settings > Post types > enable for static blocks.
Do not use WPBakery and Elementor to edit the same content, because it can create a mess in content structure.
If you want to use WPBakery to edit menu static blocks, create such blocks from scratch and select them for the menu. Here you can find some videos about menu – https://www.youtube.com/c/8theme/videos
Regards