hello.
The drag function does not work in the doc example.
Even if you copy the source code, it doesn't work. 
keenthemms : seven-html-pro
doc Url : https://preview.keenthemes.com/html/seven-html-pro/docs/general/draggable/restricted
Hi,
Thank you for reporting this issue. We will check it further and provide a quick fix asap.
Regards.
Hi,
You can fix this issue by referring to the following steps:
1. Follow 
Quick Setup guide.
2. If you are using Gulp go to core/html/tools/gulp.config.js and change the draggable build config as shown below:
draggable: {
 src: {
 scripts: [
 "{$config.path.node_modules}/@shopify/draggable/build/umd/index.min.js",
 ],
 },
 dist: {
 scripts: "{$config.dist}/plugins/custom/draggable/draggable.bundle.js",
 },
 },tools/webpack/plugins/custom/draggable/draggable.js and change the build config as shown below:require("@shopify/draggable/build/umd");var containers = document.querySelectorAll(".draggable-zone");
 var swappable = new Draggable.Sortable(containers, {
 draggable: ".draggable",
 handle: ".draggable .draggable-handle",
 mirror: {
 //appendTo: selector,
 appendTo: "body",
 constrainDimensions: true
 }
 });