Window treatment suggestions?

I’m not much of an anything person. Most of our windows have no blinds but the ones that do are either horizontal or vertical and came with the house. I’ve honestly never had curtains in my life. We’ve always had the cheap plastic-y blinds.

Curtains look appealing but with such a big window, would it work? And like I said, I want to block pupper from being able to see outside most of the time.