I would've been able to tell.
anyways, I noticed it has a fullscreen/not-fullscreen toggle and hitting that can change things up a bit, depends though.
I've since ditched BlueStacks since it asks for payment, either in downloading a bunch of apps or in money.
But I couldn't fix the play store.
I also fiddled with the settings, I think, memory serving, there could have been some orientation settings or something related to screen in the settings.
argh, I literally poked through all the settings when I was playing with it and I can't remember it all.