It is actually very easy. Well, it seems like that you are missing something in the setup process.
Please check the followings:
- Check to see if you entered the first/largest breakpoint correctly in the widget option panel.
- Make sure that non of the widget copies have full-width option checked in Muse, keep them to be as full width in the design view, but turn off the option for full-width in Muse. Since the widget is responsive it will take care of it, so just make it full-width in the design view, and after Muse automatically triggers the option (Full-width), just put the option back to "responsive width" and the widget will be fine.
- Make sure that the widgets are not pinned.
If you met all the conditions above and you still get some result that is different from what is supposed to be, you need to send us the file to firstname.lastname@example.org, and mention your issue, then we will be able to look into it and see what needs to be changed in order to sort out the issue, thank you.