[Plugin: NextGEN Gallery] Cannot return to page after viewing a picture

Hello. I just installed NextGEN Gallery and it has everything that I need! I am facing a bit of a glitch there though. I am displaying a gallery on my page: https://zumbawithyana.com/fotos-und-videos/ and when I click on a photo to see it big I can browse through all the rest of the photos from this gallery, but when I want to go back to the rest of the content of the page, I can’t: “Esc” doesn’t work, there is no “x” button – how can I close this pictures preview and go back to the page? Thanks a lot for your answer!!