Thank you for your post.
At this time, if you double-tap a blank area on a layout, FileMaker Go will zoom in/out.
Please enter a suggestion to stop the zoom into our Feature Requests web form at:
These suggestions are read by our Development and Product Management departments where they are then discussed and considered for a future release. Although I could copy your post and paste it into the web form, there are some additional questions asked on the web form that only you can answer.