On deer, I have a window open to shoot through and I have it covered with netting. The double bulls that I use have a horizontal window and they come with netting to cover that window. My broadheads are fixed and I shoot through the netting. I’ve only shot deer out to 20 yards in a ground blind and never had any arrow deflection. That netting really helps hide you in the blind.
On turkeys, no need for netting.
And you are correct, keep the other windows closed.
