Make question optional based on previous answer

[Kal_Lam]

Maybe you could do this as outlined in the post discussed previously:

Custom Logic in Mandatory Response

Hi @adepuk, It’s not always that you wish to see your variables mandatory (where the variable should be filled, else the filled-up form would not get submitted to the KoBoToolbox server) or optional (where the variable could be left blank and the filled-up form could still be submitted to the KoBoToolbox server). You might sometimes wish to make it mandatory for certain criteria. It is a form of a mandatory response if and only if it meets a certain criteria else it would act as an optional re…

If you are using the form builder UI, you could do the same through the Mandatory Response>Custom logic as shown in the image below: