DDPM Phantom Monitor - MacOS

I have 2 MacBook Pros connected to a U4919DW monitor using the network KVM.  When I use the hotkey to switch between input sources the windows that were open on the monitor initially do not return to the laptop screen.  They appear to be still on the monitor behind the other MacBook's screen.  The only way to get them to pull over is to disconnect the monitor by pulling HDMI or USB-C cord out of the laptop.  Is there a setting in DDPM to force windows back onto the laptop screen when switching?