NOTE - initial set of new angular-based pages is now live for all users.  Beta testers will continue to get to see newer pages before they get rolled out to everyone.  To find the current list of pages in Beta test mode, see https://ccr.intersystems.com/ccr/ng/faqs and search for 'beta' in the search box 

@Janne Korhonen - typically these are managed using System Default Setting: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.cls...
 

thanks @Luca Ravazzolo  ... so in the case of day2 operations you really can't take the source control rollback approach to back out the change to default behavior... unless you are versioning you CPF files post CPF Merge, you must do another CPF Merge change, and know what the prior values were in order to actually revert the change in the environmental, correct?