The ornamental design for a displayscreen or portion thereof with a graphicaluserinterface.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee. A description of the drawings is as follows:
FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with a graphical user interface, showing my new design; and,
FIG. 2 is a front view of a second embodiment of a display screen or portion thereof with a graphical user interface, showing my new design.
The broken lines illustrate the display screen or portion thereof and form no part of the claimed design. The broken lines illustrate portions of the graphical user interface and form no part of the claimed design.