Different selection colors in Layout - why?

I have a script that exports scenes to layout. In the exported layout document all exported entities have a red outline when selected. Entities drawn directly in the document have a blue (normal) outline. In the image below the geometry is from an export and the dimension is drawn in Layout, both are then selected. My questions are, where does the red outline come from, what does it mean and how do I get a blue outline?

Selection is red when the entities are on a layer which appear on every page.

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ahh, thank you! I couldn’t for the life of me figure that out…