Display screen or portion thereof with a graphical user interface

The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawings will be provided by the Office upon request and payment of the necessary fee.

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

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof;

FIG. 4 is a front view of a fourth embodiment thereof;

FIG. 5 is a front view of a fifth embodiment thereof;

FIG. 6 is a front view of a sixth embodiment thereof;

FIG. 7 is a front view of a seventh embodiment thereof;

FIG. 8 is a front view of a eighth embodiment thereof;

FIG. 9 is a front view of a ninth embodiment thereof; and,

FIG. 10 is a front view of a tenth embodiment thereof.

The dashed broken lines in the figures show a display screen or portion thereof, and form no part of the claimed design. The dot-dash broken lines in the figures and the areas within the dot-dash broken lines show portions of the graphical user interface that form no part of the claimed design.