In order to view the STUDIO site in an environment with restricted domain names for security reasons, such as company networks, it is necessary to have permission to view the following domains in addition to your own site domain name
storage.googleapis.com （Site data acquisition）
fonts.gstatic.com （Google Fonts)
cms.studiodesignapp.com （CMS data acquisition）
firestore.googleapis.com （CMS data acquisition）
Also, if you are using an external app, please allow the following domains for the operation of the app.
Google Tag Manager
Also, if you are embedding content from an external site in an iframe, you will need to allow all of their domains as well.