Alter My Guides?

Press Command-Option-G (PC: Ctrl-Alt-G) to select all the guides on a page or spread. If you want to draw both a horizontal and a vertical guide at the same time, press-and-hold the Command (PC: Ctrl) key as you click-and-drag from where the rulers intersect at the top left of the document window (if the rulers aren’t visible, press Command-R [PC: Ctrl-R] to toggle them on). If you’re dragging out a vertical guide but want to quickly change it to a horizontal guide (or vice versa), press-and-hold the Option (PC: Alt) key as you drag. If you want to delete all the guides, Right-click on either ruler and choose Delete All Guides on Spread. You can also use the Smart Guides feature built into InDesign, which will give you visible guides that items will snap to when you’re lining things up. To turn these guides on and off, just go to View > Grids & Guides > Smart Guides.