Caution to anyone "upgrading" from 17.1 to 17.2:
Do not sample the different Layouts. Because if you do you will lose almost all of your tweaks and customization. It appears that the Zorin devs removed functionality from Zorin Appearances, especially as regards the Launcher settings that now has no means to adjust corners, colors or opacity. Or, it may be a bug.
I lost the opacity of my Launcher. I also lost Applications in the upper-left Top Bar, which will require a command line execute to reinstall the feature to GNOME Tweaks. And I don't recall the command.
Again: Do not sample Layouts. Doing so will hose almost all of your customization. Twice burned now, thrice shy.