Q: Can I edit on the front end?
Only on the editing screen?

Sebastian_Microthemer
May 15, 2024A: Microthemer loads the site frontend inside its interface (the home page is the default page, but you can switch pages via Settings > Page > search. You can style any frontend page that way.
Since the recent beta release on May 3rd, you can also style Gutenberg blocks by loading the block editor inside Microthemer. But that is an optional workflow, you can still style the frontend page directly.
Microthemer also has an advanced feature for customising the appearance of the WordPress admin area. This featured must be enabled in Microthemer's preferences by setting "Support admin area point and click editing" to "Yes".
I hope I've answered your question, but let me know if not!
Thanks,
Sebastian
Do you mean that I can edit the actual page directly instead of the Gutenberg editor screen?
Yes, you can style any frontend page on your site using Microthemer.
But just in case you were in any doubt, Microthemer is purely a tool for making CSS style changes. It's not a content editor like Gutenberg or Greenshift. It's designed to work alongside any WordPress content creation tool - to help you make style changes not supported by other tools, or in a more efficient way (without repeating styles for multiple elements on the page). The Gutenberg demo explains some of the benefits Microthemer brings, which apply to page builders in general:
https://themeover.com/gutenberg-responsive-css-using-microthemer/
I bring this up because your other question asked about copying and pasting HTML, which isn't something Microthemer deals with - just CSS.