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 our new design;
FIG. 2 is a front view of a second embodiment of FIG. 1; and,
FIG. 3 is a front view thereof, shown in an alternate environment.
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.