I would suggest posting a screenshot of your script and of the blue ticket you are referring to in your post.
Entering any of the yellow fields triggers a basic script to enter find mode.
Thank you for your posts.
Are you unable to return to tap Cancel? Does anything occur when you tap "Include Matching"? Are you able to return to the Home screen?
Does this issue only happen on this solution? If so, your file may be damaged. If not, try rebooting your iOS device and try again. If it still fails, then reinstall FileMaker Go.