The Sidebar of Adobe

Hi all! Got a real minor issue here that just causing some annoyance for a couple of clients.

I am working as a consultant on a lawyer firm.

We've had several requests to have the Sliding Sidebar being minimized from start! Right now every time they open a pdf they have to close it, opening several hundred a day makes this rather frustrating.

Sending a picture so you'll see what I mean. Anyone who knows how to do this?

Kind Regards

Calle