Hi, i am not sure when this issue first started but here it goes. I have 2 variants, desktop (1440px) and mobile.(375px). Both of them are fixed width.

When i put the desktop variant into an autolayout frame, the instance became Fill width. So when i change the instance variant to mobile, because it is now Fill, it stretched to the whole frame. Please see the video below for the issue.

Hope to get a response!