U2723QE, stop from switching PCs when no signal occurs

So, I have this U2723QE connected to 2 PCs. Running Windows. For the most part everything works beautifully. However, I am regularly working on systems and rebooting and disabling video drivers, etc.

When one PC is restarted, naturally, the U2723QE loses the signal from that device. The U2723QE then takes it upon itself to search for another signal which usually switches it to my other PC which is usually on that I am using to run tests or monitoring the PC which I am working on. 

Is there any way to stop the U2723QE from this behavior of automatically searching for active signal and switching?

I am fairly capable of switching the monitor when I need to switch it?

#whenmachinesthinktheyresmarter-FAIL

LOL...

Any suggestions greatly appreciated.

Thanks,
T