Studio Display

A Mac mini can't use more than one Studio Display. The Studio display is 5K resolution and connects via Thunderbolt.

The latest Mac mini:

Mac mini (M1, 2020) - Technical specifications

"One display with up to 6K resolution at 60Hz connected via Thunderbolt and one display with up to 4K resolution at 60Hz connected via HDMI"

The latest Intel Mac mini:

Mac mini (2018) - Technical Specifications"One display with 5120-by-2880 resolution at 60Hz connected via Thunderbolt 3 plus one display with 4096-by-2160 resolution at 60Hz connected via HDMI 2.0"

In addition to the spec's and other info that Malcolm J. Rayfield has shared,

also have a look at > Connect a display to Mac mini - Apple Support

Anomalous8000 Said:

"Studio Display: How do I run dual Apple Studio displays with Mac Mini?"

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Refer to the link provided atop this post.