This behaves a little differently to Solve, My Computer since when the Background Solve finishes, you have to right click on the Solution branch and Get Results. But if you want to use your computer to do other things while you wait for the solve to run, you can pull down and select My Computer, Background. When you decide you want the solution as soon as possible, and you will perhaps walk away from your computer or just wait, you click Solve and the default is My Computer. You can configure the first with 4 cores and the second with 3 cores. It lists two options: My Computer and My Computer, Background. To anchavan's point about leaving one core to do other things: Mechanical provides two options that can be configured differently. I have a desktop computer that is dedicated to solving ANSYS models and I turned off Hyperthreading so there is only one thread per core and therefore my performance meter does reach 100%.
That means you will only see about 50% on your performance meter that counts threads not cores. The solver consumes the core, which spends very little time waiting for data, so ANSYS is programmed to submit jobs to cores, not threads.
You have properly setup ANSYS to use all your available cores.
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