The ornamental design for a displayscreen or portion thereof with a graphicaluserinterface, as shown and described.
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.
FIG. 1 is a face view of a first embodiment of a design for a display screen or portion thereof with graphical user interface, in color; and,
FIG. 2 is a face view of a second embodiment thereof, in grayscale.
The broken lines showing of a display screen or portion thereof with a graphical user interface is included for the purpose of illustrating environment and form no part of the claimed design.