Make sure your elements scale proportionally. If not, then make sure you at least edit the Max and Min height and width in order to ensure the elements scale correctly for different mobile screen sizes. The issue you may be having is that your mobile view is set at too large of an editing size for the device you own.
For example: An iPhone 11 has a screen width of 412 pixels. So if you are making edits on a 500 pixel template and you aren’t making it so the elements adjust their size proportionally then all of the elements on the remaining 88 pixels will not be visible on an iPhone 11 screen.