How to change questions option from select many to select one?

[Kal_Lam]

@henrique, this post discussed previously should help you solve your issue:

Changing question from "Select One" to "Select Many"

Welcome back to the community, @l.pomana! Kindly please be informed that changing a question type from select_one to select_multiple is not possible through the form builder UI. However, you could do the same if you download your survey project as an xlsform and then make changes and redeploy them back to the existing survey project.

Note: It’s always advised to be cautious while doing the same as it may cause data export errors. Maybe instead of changing the question type from select_multiple to select_one you could drop the select_multiple question and have another question that holds the select_one in the next version of your survey form and redeploy them. And for this, you will also have to use a different variable name. This minimizes the data export errors.