Interesting.
And are you ABSOLUTELY POSITIVELY 100% sure that the overall brightness of the prints (not individual colours, overall brightness) is not significantly different from your screen?
What? No, upload the same digital files that you sent to the lab. Unless you have solar-powered internet, the brightness of your room has nothing to do with it.
Sorry, I don't know of a way either.
The only way I'm aware of is to select them all and temporarily add them to a Collection. Then the stars filter will be accurate for that set.
That and a heck of a lot of other stuff. When I sent you that email prompting you to take the Layers & Masks Class before embarking on Levels and you said "It's ok, I know the basics" you were rather mistaken, I fear.
It's not too late.