Use menu „File/Preview in Browser“.
InBrowser Editing is something completely different, which you may easily find out using Muse‘s help system.
I think the OP wants to edit in browser like Wix, etc?
I have a page made with Muse, but I would like then to finish the editing part as you do it with Wix or any similar (like in browse editing). So I can fix the objects as they will appear once I have published the webpage.
The main problem is that I do not know how to adapt the size of the objects to every screen. I have already used the break points mixed with the fluid width and it does not work very well.
The preview in browser does not allow you to edit, and the InBrowser editing does not allow you to move the objects.
I would like to have both options hahah.
Simple answer: forget it!
For small modifications like text edits or replacing (not adding) images, you may use Inbrowser Editing.
To modify a Muse site, you need Muse.