Click on the Apple logo in the top-left corner of the screen.How to check which macOS version your Mac is running As of May 2021, Citrix Workspace App 2104 is compatible with MacOS 10.15, Mac OS Big Sur 11.0.1, Mac OS Big Sur 11.1.1, Mac OS Big Sur 11.2, Mac OS Big Sur 11.3.1. Make sure to download the app version suitable for your OS version. If you have already installed the program, please proceed to the “ Login and Use WLP (UTMcitrix)' step. For first-time users, you will need to download a program called 'Citrix Workspace App' here.