Display Screen or Portion Thereof with a Graphical User Interface

A portion of the disclosure of this patent document contains material to which a claim for copyright is made. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but reserves all other copyright rights whatsoever.

FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with a graphical user interface;

FIG. 2 is a front view of a second embodiment of a display screen or portion thereof with a graphical user interface; and,

FIG. 3 is a front view of a third embodiment of a display screen or portion thereof with a graphical user interface.

The dashed broken lines depict portions of the display screen or portion thereof with a graphical user interface and the display screen itself, and form no part of the claimed design. The dashed broken lines showing a device are included for the purpose of illustrating environmental structure and form no part of the claimed design.