Hey @jenishpandya,
The siteground optimizer plugin is causing the issue to your website. Optimization plugins often combine scripts and reorder them and the common cause of issues as some scripts should not be combined, minified nor re-ordered. That is the case with our products so please contact Siteground or the developers of SG Optimizer to exclude everything from Pro from any kind of optimization. Don’t worry, our themes are optimized out of the box so they don’t need third-party optimization.
Or you can resolve the issue by going to SG optimizer plugin on the site head over to the front end optimization tab and toggle off Minify Javascript files. This minification is what is stopping the editor from loading.
Hope that helps.