Setting the margin and column guides

In an earlier movie, we saw that the New Document dialog box, lets you set your…margins and column guides.…But what if you change your mind later, after the file is already created, or…what if you want different margins in different parts of your document?…No problem, that's where the Margins and Columns feature comes in here under the Layout menu.…But before you choose this feature, you need to tell InDesign which pages…you want to affect.…To do that, I'm going to go to the Pages panel over here in the doc.…Right now, I can see that I'm looking at pages 24 and 25, and I can tell that…because those of the pages that are highlighted down here.…

That's not necessarily the pages that are selected.…For example, I can click on page 21 up here, and now I'm looking at pages 24 and…25, but I've targeted I've selected page 21.…So if I go to Margins and Columns, it will affect page 21, not the ones I'm looking at.…So you have to be a little bit careful there.…In this case, I do want to affect the pages I'm looking at, so I'm going to…