I recently purchasing the U4025QW. I connected two different PC's to it and am using the PBP and Network KVM. 

For some reason, the KVM is not passing through some of the keys when using the KVM. Ctrl, Alt, Enter, Del, etc. Normal A-Z and 1-0 keys work fine. This only happens when using the Citrix Workspace app that I use for work and accessing a VDI. When in Windows 11 directly those keys work fine.  

1st PC is connected through USB and DP, 2nd PC is connected through Thunderbolt/USB-C.  

Second issue I've had is using a Logitech mouse. If I do not have a 2nd receiver plugged in to the 2nd PC, the mouse cursor disappears going to the 2nd PC. If the receiver (which isn't in use but recognized by the PC), the cursor stays visible.  

Not sure if this is a Dell issue, Windows issue, Citrix workspace issue, or some combination of all 3?