htop, show cpu side by side

Go to settings (F2), under Meters, you select what is in the left column and what in the right column. Instead of CPUs (1/1) in the left column, select CPUs (1/2) for the left column and CPUs (2/2) for the right column. F10 to save the changes and it's done.

As I answered to this more recent version of the same question, this problem can also occur when you use a version of htoprc that has been optimized for a computer with less CPUs. This is like to happen when you use LDAP or some other system to share your home folder between computers.

You can solve this by deleting .config/htop/htoprc and starting htop on the computer with the most cores of the one you use. This will write an htoprc file optimized for many cores (i.e. with four columns for CPUs).

For more details, visit my answer on the other question that I linked above.