How to hide certain values in a field before other fields are entered?

@chenboly, you could do it using the trigger option as shown in the image shared below:

In the survey tab of your XLSForm:

Image 1

Data entry screen as seen in Enketo: when nothing is entered

Data entry screen as seen in Enketo: when a value is entered

Reference XLSForm:

trigger.xlsx (10.3 KB)