Problem editing photo (histogram showing)

[Dana Muscarella]

When I edit a photo and try to select a preset or just edit it, a long rectangular box appears with colors in it and it covers the photo while I'm trying to edit it . I don't know what it is and I'm trying to remove it so I can edit my photo properly. Can someone tell me how to remove this box? 

 

(Title edited by Moderator)

[selondon · Accepted solution]

That's the histogram. Double tap with two fingers on the screen to cycle through the overlay options.