MacBook Pro stuck on Migration Assistant during data transfer

Jd11g wrote:

I bought a new Mac mini M4 the other day. I have a 2011 MacBook Pro that I was transferring info to the mini. I quit the application on the mini, but now my MacBook is locked up on the transferring information screen. The screen says transferring your information information is being transferred to your new Mack and also starting up with the blue line across the screen, I have tried option command, escape, and other buttons, but I cannot get off this screen. What do I do next?

[Re-Titled by Moderator]

If necessary you can force quit a shutdown by holding the power button/TouchID for ~6-10 sec.

Force Shut down your Mac.

Log out, sleep, wake, restart or shut down your Mac

Shut down or restart your Mac - Apple Support

The most trouble free way to move to a new machine, is using the Setup Assistant on the initial boot of a brand new machine— you have one shot here. Set up your MacBook Pro - Apple Support

The second best way is use the Migration Assistant.

How to move your content to a new Mac Transfer to a new Mac with Migration Assistant - Apple Support