"First steps" pop up comes always

Hey,

in my Acrobat there is a pop up window "first steps" that appears with every file that I open. Even if Acrobat is already running.
I can close it (X), but it will pop up with the next file.

Here a screenshot (in german):

Anybody an idea how to disable this function?

I have got a new PC, latest version of Acrobat (no updates available).

Hope anyone can help?