Make sure everything's clean and greased.
Fit the wheel and axle, but don't tighten it.
Bounce forks up and down a few times to settle the axle/wheel into "the sweet spot". Tighten as normal.
I don't have a Maxle so not sure of the mounting procedure, but have similar "play" on Fox QR15s and 20mm 36s with Hope hubs.
The method I have described removes this play. I think I found this info on the Mojo website.
You could try adapting this for Maxle fitting procedure.