XMrig (new) need help to limit max cpu usage

Hello there.

I m prety new to mining. I want my CPU to mine Monero while the GPUs are mining eth on my rig. I archived to do that, the problem is i dont want the cores of my cpu to be at 100% at all the time so i want to reduce the max usage ( not the max threads, cause i only have 2 cores and i want both to work on monero)

I tried this :

But it didnt work, any help ?