AI Summary 
By default all questions in the questionnaire are mandatory, so they necessarily require an answer to proceed with the interview.
An option allows you to make the answers optional.
To activate this setting you need to click on the question gear and enable “Optional answers”.
In the same way, you can activate this option in each matrix row or each 3D matrix cell. Also, on the matrix questions gear, a button is available to make all rows (or cells) optional or mandatory with a single click.
