This is Brilliant 🙂
I’m not sure how long you’ve been able to do this, it may have been in the product for a while, however I’ve only just discovered it.
Normally, when I need 3-tier access in App Designer I go through the process of setting up a profile in Config Manager. I believed this to be the one and only way of getting it to connect. There is a shortcut, however:
This isn’t a strangely named profile chosen from the dropdown. I’ve just specified the App Server IP (or hostname) and the WSL port and it will connect. This also gets around having to know the Domain Connection password (which you’d need to enter if setting up a Config Manager profile.