I would like to set the default options for a multiple selection

[Kal_Lam]

Welcome back to the community, @chicharo80! This post discussed previously should help you solve your issue:

How to create a "select all" option to automatically choose all in a select many question?

@dkiyiola, you could do it as outlined in the image shared below: In the survey tab of your XLSForm: [Image 1] In the choices tab of your XLSForm: [Image 2] Data entry screen as seen in Enketo: [Image 3] Reference XLSForm: Select Multiple (PreFill).xlsx (13.0 KB)