Does not open the blueprint

I tried to open several Blueprint but it does not open them, I open a page with a white background but if I open it gives me nothing. I have also tried to make a new Blueprint but it gives me the same problems. I’m at the end of a game I do not want to lose all the data.

Hey there, can you send a screenshot of the problem?

If windows 7
hover mouse over the icon in taskbar that displays the white screen with unreal icon in the middle and click the preview for it, then hold your windows key and press the up arrow.

If windows 10
hover mouse over the icon for the blueprint editor window and right click then click maximize