The ornamental design for a displayscreen or portion thereof with graphical user interface, as shown and described.
FIG. 1 is a front view of a display screen or portion thereof with graphical user interface showing the new design;
FIG. 2 is a front view of a second embodiment thereof; and,
FIG. 3 is a front view thereof, shown with an alternate environment.
The outer broken line in each Figure shows a display screen or portion thereof. The broken lines showing a display screen or portion thereof form no part of the claimed design. The broken lines shown on the graphical user interface form no part of the claimed design. The different shades of gray are intended to show contrasting appearances of the different areas of each figure.