Hi
Horizon Client 4.6.0 on a Macbook Pro (13-inch, 2017, Four Thunderbolt 3 Ports) running High Sierra 10.13.2.
Apple has removed the option to exit a space from the "spaces bar" in "mission control".
When View is maximised to a "space" it does not provide a menu drop down to enable minimising the app window so that other menu items can be accessed. Now that Apple have removed the exit button from the spaces bar, I can no longer access View menus once I have elected to run the app window at full screen.
This is a pretty significant loss of functionality!
Mike