Are you a PC with an operating system, or are you the operating system? Are you the owner and possessor of will, or are you exercising will? That's the significant difference.
Both. What's the significance?
With a thought. He wills it. (More below.)
"God" is present in all of creation. What "God" wills with but a thought is what is at any (and every) given moment. Every moment is the present to the "God" that is present in every moment.
Look at it this way, perhaps: "to design" takes forethought. When each moment that is is happening "now", when is there time for forethought? Creation happens now.
When he creates something with a thought, he conceives what it is that he's creating, yes? If he thinks, as he creates it, about what it is and how it works (and this is all somehow happening in the present moment), he designs it, does he not? So bringing this full circle...
If I may butt in... Free from the agency of "God", i.e. "separate from God". From this perspective, our will is not "designed," else it couldn't be will, and it couldn't be ours.
...I'm having a hard time understanding why: if this god conceives of and creates our will (with a thought, in the present moment), then our will belongs to us, but if he puts some forethought into creating it, then it's not ours.
It is incoherent in the framework of determinism, but it didn't come from there; it came from "now", from the person present in the current moment exercising will.
Still, I ask, how does the person present in the current moment decide to do something if he has no preferences for what to do? Or are his preferences suddenly materializing, completely unrelated to the past?