but I can't say I paid its default desktop wallpaper any mind at the time—I pretty much immediately swapped it for videogame concept art or something. But that was because I just assumed it was ...

Right click on the image and select 'Save image as...' Select the folder you want to save the photo in. Locate the photo within the folder, right click on the photo, and select 'Set as desktop ...

I admit: I'm fascinated by Apple's new Dynamic Desktop feature, which became widely available with the launch of macOS Mojave last week. There's just something magical about a wallpaper that shows ...

Basically, the Desktop icon fonts are dynamic and change accordingly to the desktop background so that they are readable. Try this workaround and see if it helps. Open Settings > Personalization.