This question should have been sent to users@global.libreoffice.org <users@global.libreoffice.org> instead of the developer mailing list. As you can see, I have sent a copy of this email to the proper mailing list.
The answer to your question is found in how to use styles. These topics are covered in the Getting Started Guide and the Writer Guide. Between these two guides, there are three chapters on how to use styles. https://wiki.documentfoundation.org/Documentation/Publications is the link you need to get them.
Specifically, the "Default Style" paragraph style has a tab "Indenting and Spacing". At the bottom of it is a checkbox under the heading "Resister-true." Click it to activate it. If all of your paragraph styles are based upon the "Default Style" paragraph style, this should apply register-true to the whole document. Double check with the references that I mention above to be sure.
Dan