Connecting to Multiple VMware Horizon Desktop
Multiple virtual desktops from the same connection server but in different desktop pools.
With Horizon Client, you will be able to connect multiple virtual desktops you are entitled to from just single instance whether on Mac of Windows as the Horizon Client window will be left open for you to select other virtual desktops to connect.
Mutiple virtual desktops from different connection servers.
In this case, you will need to launch another instance of Horizon Client to connect to every connection server. In Windows, this is easily done however on Mac, this might be a challenge. You can of cause run a commend as written by this author here, to run another instance on Mac via Terminal window and keep it on the dock so you get two instance anytime you need it.
Can I connect to multiple virtual desktops from the same desktop pool with the same user credential?
How can I connect to multiple desktops with same user credential?
Create multiple desktop pools as each user credential is only entitled to one desktop connection per desktop pool.