The screen is cut off in Edit mode
Interface elements can be pushed off-screen or reorganized if the screens and/or the Guides side panes are open.
Solution
Close the panes.
For more on template settings, head over to the article Create demos part 1: create & share templates and Create demos part 4: create demo guides.
If the screen is cut off in Preview mode:
This issue is typically related to how the captured platform organizes its layout based on screen size.
Solution
Navigate to Settings > Display Options and set the template to proportional fit. This setting ensures that demo viewers can see the entire screen (independent of screen/device size).
For more on screen displays, head over to the article Create demos part 2: set display settings.
Watch the demo