In the top command on a FreeBSD Unix operating system, you can display the CPU usage per core by using the m key.
To do this, run the top command in your terminal, then press m while the top display is active. This will toggle the display between the default multi-process mode and the per-CPU mode. In per-CPU mode, you can see the CPU utilization for each individual core.
You can return to the default multi-process mode by pressing m again.
Note that the top command provides real-time information about system resource utilization, including CPU usage, memory usage, and process information.