On your profile there is a section called "Watches". There you can see what spaces and pages you are currently watching.
You may access your profile from the drop down of your user icon on the upper right (I do not know what this button is called ).
Please see this blog post for details:
Also, using REST API:
Hi team, I’m Avinoam, a product manager on Confluence Cloud, and today I’m really excited to let the Community know that all customers can now try out the new editing experience and see some of the ...
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