Hey Alex,
1. Microthemer has been designed to work well with Beaver Builder at the same time – from one screen. For instance, some extra care has been taken to ensure the inerface elements don’t compete with each other. With other page builders, most people add content with the builder, and then leave the builder to go to the Microthemer interface where they can make style changes.
It’s fine to have Microthemer installed alongside any page builder though, in case that’s what you were asking.
2. Many users make changes with Microthemer and then disable or even completely uninstall Microthemer before handing the site over to the client. You can still make use of the style changes by copying and pasting some code to your theme’s functions.php file. You can find the most up to code by going to Microthemer’s Preferences, and then clicking the tab called ‘Inactive’. The code loads the stylesheet Microthemer generates (wp-content/micro-themes/active-styles.css), as well as any Google fonts used in your design.
I hope that helps. Please let me know if you have any further questions.
Thanks,
Sebastian