One of those things that tells you just how seriously Big Business IT, as a whole, takes the Mac. This is not as much a request for advice as a bellyache and thread to share experiences and updates.
For security reasons, my employer does not want us doing work locally on personal machines. So if I'm not using my work-issued laptop I must connect with work applications via Citrix application hosting. I typically spend several hours a day connected to our hosted applications, so how well they work is a big deal.
Citrix has been replacing its old Receiver client, across all platforms, with a new client called Workspace. Among many other changes, Workspace has a brand-new rendering engine. It uses Metal on Mojave, ostensibly to speed up performance. But since before the public release of Mojave there have been near-universal complaints about Workspace's performance on Mojave, confirmed by my personal experience. Hosted apps are often very slow and the client seems to have trouble transmitting some events to the server. This persisted through client versions 1808 and 1809. There is now a pre-release build of 1811 on the (mostly deserted) Citrix Mac support forum, with a claim that it solves the issues. But, at least in my usage, it is only a little bit better.
The solution is to revert to the previous product, Receiver 12.9.1. It occasionally acts odd around the edges, but performance is about as good as you could hope for applications hosted on a resource-starved VM across the internet. But Receiver is 32-bit only, so won't work with macOS 10.15, and also is not guaranteed to work with future versions of the Citrix application hosting platform.
Only Mac users get to live with/work around disabling performance problems in critical enterprise applications for months at a time, without any evident urgency by the vendor to fix them. Sigh.

Citrix Viewer For Mac
Citrix Receiver

Select Uninstall Citrix Workspace App and follow the on-screen instructions. The.dmg file is the file that is downloaded from Citrix when installing Citrix Workspace app for Mac. If the file is no longer on your computer, download the file again from Citrix Downloads to uninstall the application. Apr 07, 2021 Citrix Casting is used to cast your Mac screen to nearby Citrix Ready workspace hub devices. In this release, support is provided to mirror your Mac screen to workspace hub connected monitors. For more information on Citrix Casting, see Configure Citrix Casting.

To access your ProZone from devices not managed by ProCirrus, you will need to download and install the appropriate Citrix Receiver or Workspace for your device.

Windows Computers please Download and install the following:

Windows 10 (not upgraded from windows 7 or 8):
https://www.citrix.com/downloads/workspace-app/windows/workspace-app-for-windows-latest.html

Machines upgraded from or running Windows 8 and below – Use Citrix Receiver 4.9.9000 LTSR:
https://support.procirrus.com/CitrixReceiver.exe

For MAC Computers please download and install the following:

Citrix receiver mac mojave funktioniert nicht

For MAC Computers with OS versions up to 10.12 (names shown below) navigate to:
Mac OS 10.12 and earlier

Mac OS X Public Beta
Mac OS X 10.0 Cheetah
Mac OS X 10.1 Puma
Mac OS X 10.2 Jaguar
Mac OS X 10.3 Panther
Mac OS X 10.4 Tiger
Mac OS X 10.5 Leopard
Mac OS X 10.6 Snow Leopard
Mac OS X 10.7 Lion
OS X 10.8 Mountain Lion
OS X 10.9 Mavericks
OS X 10.10 Yosemite
OS X 10.11 El Capitan
macOS 10.12 Sierra

For MAC Computers with OS versions 10.13 and newer (names shown below) navigate to:
Citrix for Mac OS 10.13 and Newer
macOS 10.13 High Sierra
macOS 10.14 Mojave
macOS 10.15 Catalina

Citrix Viewer For Mac

Once you have installed the Receiver/Workspace application you can access your applications with your normal system credentials by navigating to your normal portal which is either: https://login.procirrus.com OR https://myportal.procirrus.com

Installing on Windows Desktops

When prompted save the 'CitrixReceiver.exe' download.

Find the file from your web download folder and launch it.

Citrix Receiver

Start the installation in the Welcome to Citrix Receiver dialog box.

Accept the license agreement and click 'Next'.

For security reasons, do not enable single sign-on. Just click 'Install'.

Then click 'Finish'.

Logging in to your Applications

Open your browser and navigate to your normal login site.

If you use multi-factor (i.e. a text code) navigate to https://myportal.procirrus.com
If you don’t use multifactor just navigate to https://login.procirrus.com

Then log in with your normal credentials. Depending on the browser and computer the first launch of an application may result in other steps. See common other steps below.
Other Common Steps
1. Sometimes, when you first launch an application it may appear as a download on the bottom of the browser. If you see a download file that ends in .ica. Just click Open
2. Then you may you may get a popup with the first application you launch - Choose the Citrix Launcher and click “Remember my choice…” then OK

3. Lastly, you may get a pop-up from your computer asking to allow it to access your computer. This is normal for Citrix so just click “Permit All Access”

Citrix Receiver For Mac Mojave