Your mouse has disappeared from the screen and you no longer have control of your NVR.
Most of the higher end Uniview NVRs have a 'Main' and 'Aux' monitor. The control has simply been moved from one to the other (whether you have a 2nd monitor connected or not).
To bring mouse control back to your monitor, simply right click the mouse for 7 seconds. The mouse control will return to your screen.
That's it! Good luck with the NVR!

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https://github.com/aletahadleywgme1-sudo/aletahadleywgme1/issues/3
https://www.jsdelivr.com/package/npm/pgslotdiamond168
https://github.com/jillanahurdzt12a-sys/Jillana/issues/6
https://github.com/gerriehorton20nnd-droid/Gerrie/issues/5
https://www.jsdelivr.com/package/npm/pgslot168-tools
https://github.com/aletahadleywgme1-sudo/aletahadleywgme1/issues/3
https://www.jsdelivr.com/package/npm/pgslotdiamond168
https://github.com/jillanahurdzt12a-sys/Jillana/issues/6
https://github.com/gerriehorton20nnd-droid/Gerrie/issues/5
https://www.jsdelivr.com/package/npm/pgslot168-tools
https://github.com/aletahadleywgme1-sudo/aletahadleywgme1/issues/3
https://www.jsdelivr.com/package/npm/pgslotdiamond168
https://github.com/jillanahurdzt12a-sys/Jillana/issues/6
https://github.com/gerriehorton20nnd-droid/Gerrie/issues/5
https://www.jsdelivr.com/package/npm/pgslot168-tools
https://github.com/aletahadleywgme1-sudo/aletahadleywgme1/issues/3
https://www.jsdelivr.com/package/npm/pgslotdiamond168
https://github.com/jillanahurdzt12a-sys/Jillana/issues/6
https://github.com/gerriehorton20nnd-droid/Gerrie/issues/5
https://www.jsdelivr.com/package/npm/pgslot168-tools