Phil0124 wrote:
Sidecar generally refers to the use of an iPad as an extra display for a Mac. Did you buy an iPad?
The OP said (emphasis mine)
"I was searching for a new display for my M4 Mini. I believed what the store specialist told me and researched it for a week before I bought it—planned to install it as a sidecar on my Older studio M1 max!"
The main dictionary definition of "sidecar" is "a small, low vehicle attached to the side of a motorcycle for carrying passengers." That's obviously where Apple got the name for the Sidecar feature. The M4 or M4 Pro Mac minis look very much like "small, low" versions of the Mac Studios. Put one on a desk next to a Mac Studio – and it would look like a sidecar, but absent special software to distribute a computation between the two, there wouldn't be any operational linkage. The Mac Mini's CPU wouldn't make the Mac Studio's CPU go faster, or vice versa.
Maybe the OP has the M4 Mac mini, but no dedicated displays for it, and is now trying to figure out
- Whether to buy a separate display for it – and if so, which one; or
- Whether to use multiple inputs (on a monitor that has multiple video inputs) and controls on the monitor itself to share a monitor between the Mac mini and the Mac Studio (one at a time).
Most third-party monitors have multiple video inputs.