How can I switch between the two computers using the SV211HDUA4K KVM switch?

You can switch between the two computers using push buttons, hot-keys, or switching software.

What video resolution does the StarTech.com SV211HDUA4K KVM switch support?

The StarTech.com SV211HDUA4K KVM switch supports a video resolution of 3840 x 2160 (Ultra HD 4K) at 60Hz.

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StarTech.com SV211HDUA4K 2 Port HDMI KVM Switch with 4 Foot Built-In Cables - OS Independent - Support for 3.5mm Audio - USB 4K 60Hz (SV211HDUA4K)

HDMI KVM switch operates and accesses two computers from one workstation at 4K60Hz resolutions
Integrate into your set up quickly with built-in 4'. KVM cables (including remote switch) and space-saving design
Switch PCs via push-button / hot-keys or switching software
Switching software supports Windows / Windows Server & macOS platforms
No external power adapter required
Independent audio/mic switching for uninterrupted audio Analog (3.5mm) and DisplayPort audio supported