Hello,
You can confirm with Citrix support but the root cause of this issue seems to be the 'Screen Recording' permission granted for DisplayLink Manager in macOS settings.
Unfortunately when using DisplayLink technology products, the ‘Screen Recording’ feature is required. This is the way that the DisplayLink powered devices can see the virtual displays being rendered by the DisplayLink Manager App. This requirement was set in place by Apple we are unfortunately unable to prevent the screen recording from being required.
As this permission is granted Citrix thinking the screen is being recorded (when in fact it is not) to protect user data will open greyed out - could be a security feature in Citrix. I am currently unable to suggest any fixes for this issue other than revoking the Screen Recording for DisplayLink Manager, shutting down DisplayLink Manager or disconnecting the DisplayLink powered device while using Citrix (which as result will disable the external monitors). If the issue is not present in built in screen or external monitors not connected to DisplayLink powered device then one can also use Citrix in those screens.
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