You can manage your Margins and Page Layout via the Page Layout Tab when in Edit mode on a Draft of your Document:
The functionality in Page Layout is very like Word functionality.
If you click Margins, you are able to manage your Margins:
The size of your Headers and Footers:
Add Columns to your Page structure:
Add a Frame (whole or any side) to your Page:
Set the orientation of your document:
Much of the functionality in the Margins popup also have quick-select buttons to achieve the same outcomes:
