Phantom box around my work area

[cherchmouse]

Any idea how to get rid of this phantom box?
It's driving me mad.

[Omar.Fathy]

If it's dimensions not change when you open another document with different size, You can check your windows or operation system.
It may be something like Microsoft Ink, touch or magnifying options.

[cherchmouse]

It's happening again.. How do I get rid of this box?