I routinely use Duet as a second monitor for my MBP, and this Alfred workflow to quickly set both screens.
And I have my wallpapers in a Finder window set up like so (anticipating gallery view and dark mode, but this is on Sierra):
I routinely use Duet as a second monitor for my MBP, and this Alfred workflow to quickly set both screens.
And I have my wallpapers in a Finder window set up like so (anticipating gallery view and dark mode, but this is on Sierra):