Property Window Doesn't Close

[ElfmanSD]

I'm new to KSP and so far love it.  However, one thing is making me crazy.  I cannot close any of the windows once I open them (see screenshot).  This happens during build, on launch pad and during flight.  It gets annoying trying to move the windows around so I can see what is going on.  Is this a bug or something I'm missing?

http://imgur.com/a/f0Cfr

KSP Version: 1.1.3.1286 mac (via steam)

No mods. Fresh install (only played a few hours).

[Edit]: If it matters, I'm playing in campaign mode but I confirmed it also happens in sandbox mode.

Thanks in advance for any advice.

 

Edited October 8, 2016 by ElfmanSD
Adding to post

[Benoit Hage]

Didn't you just pinned the windows? That "pushed' square in it seems to indicate so. 

[DrLicor]

Yep, as stated by @Benoit Hage, it seems you pinned your window. It the little square on the right top of the window. Press it again and you'll be able to see your kerbals again.