Indesign change page layout

[Bec Mac]

hi there, I'm changing an existing layout from letter to A4. is there a way to do this without having to adjust each item on every page within my 42 page document? I've tried fiddling around and it would appear that I simply have to alter each item on every page which is a pain in the a$$. any help welcome, thanks

[Ton Frederiks]

If you are talking about Illustrator, no.

But for InDesign: https://helpx.adobe.com/indesign/using/adjust-layout.html