Here's another some may, already, know, but, for the rest...
If profiles are added, when they are added they open in their own (new) browser window. You might be interested to know there is no flipping back & forth within one same window... each added Profile gets & has their own individual separate window. And both (if just 2) can be the same Channel. They can both (or more) be open in 1 desktop simultaneously. Anyway, FWIW, there you, it has been mentioned
BTW, Profiles have to be added wherever one wants, but, on each computer & in whichever Channel. ie If add in Canary, won't be in Dev or add to Canary on 1 device, won't (auto) be in another.
Speaking of desktops, it's nice being able to name them.