Display screen or portion thereof with a graphical user interface

Description

FIG. 1 is a front view of a display screen or portion thereof with a graphical user interface showing our new design;

FIG. 2 is a second embodiment thereof; and,

FIG. 3 is a third embodiment thereof.

The broken lines at the peripheries of the figures illustrate a display, and the remainder of the broken lines in the figures illustrate portions of the graphical user interface. None of the broken lines form part of the claimed design.

Claims

The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described.