How to safe the template's Page Style?

I am using this resume template: “Minimalist Résumé 1”.
Since I am not using this Page Style for all the pages, I would like to be able to save it so I could apply it at will. But when I open the interface window for Page Style it shows that this style is just called “Default Page Style”, and I cannot rename it to create a new one nor save the present style under a different name.
I could choose some of the other styles and edit them, but it opens a new window and I still don’t see how to save a new style.

CachyOS KDE Plasma, freshly installed LO, 25.8.1.1

Since the resume is an .ott, you must open it with File>Templates>Edit Template; otherwise you create a new untitled document.

Default Page Style is protected so that you can’t rename it. But you can frely modify it.

You can create a new style based on it (but it will not be a child because there is no inheritance in page styles):

  1. open the style side pane
  2. activate page styles list (fourth icon from left)
  3. right click on Default Page Styke and New
    You get a new untitled page style which is a duplicate.
  4. customise the new style any way you like
  5. give it a name ans OK

Save your modified template. Eventually, File>Templates>Manage Templates to register it with Writer so that it can be implicitly referenced.