Open a master for editing

On the Masters navigator of the Pages main tab, double-click a master page.

Alternative: on the current page, while nothing is selected, right-click empty space on page, and then select Open master.

Edit a master properties

On the Editions main tab, open the edition where the master belongs. Open the Master Data palette (Window > Palettes Sidebar > Master Data) and then change what you want.

To learn more, see also

Masters