Display screen or a portion thereof with a graphical user interface

Description

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

FIG. 2 is a second embodiment thereof; and,

FIG. 3 is a third embodiment thereof.

The broken lines showing the display screen, and all other broken lines showing portions of the graphical user interface, illustrate portions of the article and form no part of the claimed design. Shading indicates a contrast in visual appearance.

Claims

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