Charge the margins

[AvdB]

If I want to change the margins for an entire document, it's best to set them in the master page, right? Then when I adjust the margins, they will automatically change with them for each page, right?

[Catshill]

I’d do this in the document setup if you want to affect the whole document. Otherwise (in APu) create master pages with different margins.

[thomaso]

See also https://affinity.help/publisher2/English.lproj/index.html?page=pages/DesignAids/margins.html&title=Margins for further aspects, for instance:

Quote

If master pages are applied to pages, the margin settings are taken from the lowest applied master page in the Layers panel.