How do I increase my over provisioning in my WD Green SSD?

I installed the Western Digital SSD Dashboard, but it seems it don’t have this option… Is there a way where I can do that?

Leave part of the drive unallocated. For example, if you have a 1TB SSD, and you want to increase the overprovisioning by 10%, then initialise the first 900GB and leave 100GB unallocated.

Unfortunately, I have no idea of how to do this… Care to explain in more detail?
I would appreciate it very much, don’t know if would help but here’s a screen of my disk management