Hi, this can be put in place by including a checkbox in the question text and then using JS to check if the selected choice amount is equal to the total amount of choices and setting the checkbox to checked if true. Try adding the below to the question text using the Rich Content Editor’s HTML/Source view:

Click to write question text.<br>
<input type="checkbox" name="allcheck" id="allcheck" class="allcheck"> <label>All Checked</label>

Then add the below to the question’s JavaScript in the OnReady section:

var allcheck = document.getElementById('allcheck');
var totalchoices = jQuery("#"+this.questionId+" .ChoiceStructure").children().length;

this.questionclick = function(event,element)
{

var selChoices = this.getSelectedChoices();
var checks = selChoices.length;

if (checks === totalchoices) {
allcheck.checked = true;
} else {
allcheck.checked = false;
}

}

Finally, add the below CSS to the Style section of the Look & Feel:

#allcheck {
position: relative !important;
opacity: 1 !important;
z-index: 999 !important;
height: 20px !important;
width: 20px !important;
}

@Tom_1842 that works!