R C-R

For what very little it is worth, ColorSync Utility > Profile First Aid on my Mac doesn't find any issues with this profile.

According to MacTracker, every 2011 iMac has either a mini-displayport or 1 or 2 Thunderbolt 1 ports. I'm not sure what the maximum resolution supported by those ports might be, so I don't know if a mini-displayport to HDMI adaptor would work. In fact, it seems unlikely that the onboard GPU of an iMac that old would support more than a very small tablet, regardless of the maker.

Switch to the Export Persona & there should be a slice automatically created for each artboard as well as the whole document one. Each slice should have that artboard's name preassigned to it. Select all of the artboard slices & in the Export Options > Selection choose a PDF (or whatever) preset. Untick the "Background" (whole document) slice if you don't want to export it. Click the "Export Slices" button in the Slices panel to export each artboard. Simple artboards for export.afdesign

Does your iMac have Thunderbolt 2 or Thunderbolt 3 ports? Thunderbolt is fully compatible with Mini DisplayPort peripherals so you should be able to use something like this AmazonBasics Mini DisplayPort Thunderbolt to HDMI Adapter + an HDMI cable. I have a dirt cheap "no name" brand adaptor like that one that I sometimes use to connect my 2012 iMac with Thunderbolt 2 posts to an HDMI TV. Works fine.

What @Old Bruce said, graphically:

If you still can't see the Color Studio panel, try resetting the Studio.

@CJ Randolph, I downloaded your first "Pixel Pollution Test - 20190626.afdesign" file & opened it in Affinity Designer. I am confused by something that maybe you can help me with: The artboards you have labeled as "Target 1 Pixel Stroke" & "Target 2 Pixel Stroke" don't contain pairs of circles with 1 px & 2 px stroke values respectively. Instead, they are "Curves" objects (note the plural), each I believe you constructed from a pair of un-stroked circles of slightly different dimensions with the smaller one boolean subtracted from the larger one. Selecting any of them & using the Divide boolean reveals that they are not precisely centered one over the other, nor is the difference in their sizes exactly 1 px. (To see this, set Preferences > User Interface > Decimal Places for Unit Types > Pixels to at least 2 decimal places.) For example, when I do this for the divided Cyan Curves shape in Target 1, I get this for the smaller & larger curves: The divided red Curves object shows the same values, so as Curves objects they are coincident, but neither one is exactly 1 px thick, nor is anything centered on whole pixel values. Was this your intent?

Where is the resource manager in Affinity Photo?

Can I assume by 'change' you mean you used the Replace Image button, used the Options button at the bottom of the window to reveal the Embed Picture & Link Picture radio buttons, selected the same image, & used the Link button to convert it to a link? And that you did this for each of the 11 JPEGs?

What I mean is if you add up the size of the project file (with links) plus the sizes of all the files that project links to, is the total really that much smaller, even if you store all of it in a single zip archive?

But won't the linked files plus the project add up to around the same file size?

Yes.

I think you may have discovered a bug in how export slices are created from objects containing arrowhead line endings. To see it, try this with your navigation file: In either pano1 or pano2, remove the arrowheads in both curves. Switch to the Export Persona & in the Layers panel, select the pano group that includes just the two curves (without the rectangle). Click the "Make Slice" button: Now switch to the Slices panel & note that "Slice 1" created from the group is 38x20 pixels, only very slightly larger than the 2 curves.

Could you explain a bit more about what you mean by changing "flow" with a shortcut key?

FWIW, I did a few tests on another Mac that still has Affinity Photo 1.6.7 installed on it, & can confirm the change vs. version 1.7.1 (& the Mac 1.7.2 beta as well). But as I have mentioned several times, it is still possible to open files in Preview first & then in AP 1.7 (retail or beta). I just don't think that is a good idea.