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)
typesquare.com （TypeSquare）
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 Analytics
www.google.co.jp
www.google-analytics.com
Google Tag Manager
www.googletagmanager.com
Facebook Pixel
connect.facebook.net
Intercom
js.intercomcdn.com
widget.intercom.io
api-iam.intercom.io
Channel Talk
cdn.channel.io
Also, if you are embedding content from an external site in an iframe, you will need to allow all of their domains as well.