The preview screen is really useful, being able to change the size by dragging the edges; it would be even more useful if there was an element that showed the size; so say there was a point where the design gets messed up, then the user can see what the dimensions are that mess it up. Another useful feature is the measurement ability in this view using the shortcuts like in the studio
You can see the dimensions in the preview URL, E.g. https://studio.plasmic.app/projects/projectId/preview/page#width=818&height=737
Hmmm, this is what I got for this project Plasmic
OK, needed to select Homepage or something else in the dropdown select button to see it