New answers tagged url
This is the Minimal Download Strategy feature. Simply go to Site Settings, Manage site features, and deactive Minimal Download Strategy and you'll get normal URLs again.
Changing tenant URL for SharePoint Online is not possible (not right now at least). Only way to change change the URL of the private site collection (as in your case), is to cancel the old current Office 365 subscription and start with a new one. You'd have to look into ways to migrate content from domainA to domainB perhaps using some 3rd party migratio ...
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