In a form make visible only the fields or page option selected by the user from the dropdown menù

[dario_gandini]

Good morning everyone
I'm new to appsheet and can't solve a problem; I have almost finished configuring the application that will be used in our non-profit organization for the management of the fleet of machines at our disposal but that in the "Controls" form, once the variable in the "Type of Problem" dropdown has been selected (for example Oil) it appears only the field selected by the user and not all the others, I tried looking in the appsheet expressions manual for formulas that I might need

select() https://support.google.com/appsheet/answer/10108207
lookup() https://support.google.com/appsheet/answer/10107410
filter() https://support.google.com/appsheet/answer/10108196?sjid=10959286773156475754-EU

I tried them all following the guide but nothing to do even searching here in the forum I found some examples to take inspiration from (I insert below) I tried to build the formula but they did not lead to a resolution, in fact in some of the cases the field disappeared but the others remained.
Agriculture Inspections
https://www.appsheet.com/template/appdef?appName=AgricultureInspections-2078346&appId=AgricultureIns...
Lead Tracking
https://www.appsheet.com/template/appdef?appId=LeadTracking-2078346&appName=LeadTracking-2078346#UX....
Create Group forums
https://www.appsheet.com/templates/Create-group-forums-and-tag-colleagues?appGuid=2547fde9-63bf-4c13...
The databases that must interface with each other are present in the same sheet file.
Can you help me?
Thank you

[dario_gandini · Accepted solution]

Problem solved with video on youtube of this guys (Create a Customized Drop Down List Based on User Input AppSheet - Joe Tayactac) with some managed values and settings in the app