MacBook Pro as 2nd external monitor
I just bought a new Mac Studio that’s now on the way. I have a 32” external monitor that’s ready to go for it. Will I be able to use my MacBook Pro as a 2nd external monitor?
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Not as a hardware monitor. MacBook Pros have video output – not video input.
You may be able to use the MacBook Pro as a second display using AirPlay to Mac. This will work best if your MBP was introduced in 2018 or later, and is running macOS Monterey or later (see Continuity System Requirements). (I don't know which earlier MBPs and versions of macOS, if any, might work in a "second-best" way with this.)
Use AirPlay to stream video or mirror the screen of your iPhone or iPad - Apple Support
System requirements for Continuity on Mac, iPhone, iPad, and Apple Watch - Apple Support