Enlarge in the Qubes Manager, then open Computer Management inside the VM and expand the partition to match the new size.
... Right-click the entry in the Manager, then choose settings. Increase to desired size.
In Qubes manager I only see the disk storage, and memory CPU. I'm not seeing any settings in relation to the display.
Inside the vm in display settings my resolution is at max option of 1024x68.
I see. No, that is something that just follows from the screen size for me (with seamless mode disabled). E.g. when I tell it to use the left side of the screen, the Qubes Video Driver changes the resolution on the fly. Did you install the Qubes Windows tools?