Unable to access whole screen when opening Hyper-V Windows

Hi guys,

I have Microsoft Windows OS 2019 on my Dell PowerEdge R730XD server and the basic display driver has 1024x768 resolution.  Is there a way to get more display resolution options?.. because when I open Hyper-V windows I can't access the whole screen and its maddening.  Do I need an additional graphics driver?  Can you please provide any suggestions?  I truly appreciate it.

Thank you!