Hi Manuel,
Since the /notifications is a web page (although it might someday be offered as a report or view ready for use on a dashboard), I presume you are using the link you mentioned in the url of an external page on a dashboard, and then seeing the full page (including headers) within the resulting dashboard’s iFrame.
if so, you can add parameters (such as margin-top: -50) to that url to “shift” the page up within the iFrame, but it is fussy, and might look different on various computers.
Instead, I suggest you try this technique, which will then open cleanly in a separate window with one click.
You could also train users how to navigate to the Notifications tab.
Regards,
Doug