1. Go to Themes > ... > Edit HTML/CSS

2. Click theme.liquid


3. Scroll to the last row, paste code below before </body>

<script type="text/javascript">
$(document).ready(function () {
    $("body").css({
        "-webkit-touch-callout": "none",
        "-webkit-user-select": "none",
        "-khtml-user-select": "none",
        "-moz-user-select": "none",
        "-ms-user-select": "none",
        "user-select": "none"
    });
    //Disable cut copy paste
    $('body').bind('cut copy paste', function (e) {
        e.preventDefault();
    });
   
    //Disable mouse right click
    $("body").on("contextmenu",function(e){
        return false;
    });
});
</script>

4. Save

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