InDesign | Page Layout | Dashed Line Around Half of Perimeter | What Does This Mean?

Question

I'm formatting a book in InDesign. Everything appears to be working well, and I have a green "No errors" light in each of my chapters. The page borders, bleeds, and margins are set appropriately. However, the page spread features a heavy, black, dashed line on the right and bottom sides of the perimeter in the Preview mode only (View > Screen Mode > Preview). See the attached representative view taken at the bottom right corner. What does this heavy, black, dashed, perimeter line mean? Is this good, bad, normal...?

My searching via the Internet, ID Support Community, YouTube hasn't turned up anything yet.

rob day · Accepted Answer

Hi @Joe-New-to-ID , Are you sure you are in View>Screen Mode>Preview and not View>Screen Mode>Normal? The Preview mode should hide all grids and guides, but they look like they are showing in your capture.

In Normal view the guides show and the page trim guide is a black line:

If you really are in Preview mode the black line you are showing would likely print:

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