Potential issue with the design of the preview panel when deploying a site design on a SharePoint site as it's not responsive.
O365 site design screen not responsive on a minimized window While creating a Site from O365 Tenant Admin , the site gets created. Once the site created it get displayed under the active sites. Once clicked on the newly created site , then newly created site opens in a new window. Now if you minimize the screen and try to see the Site Design progress then you can see the number of steps being executed. On a minimized screen if you see the Site Designs actually the screen doesn't render as a responsive screen. It freezes the content completely.