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 first embodiment of a display screen or portion thereof with graphical user interface showing the claimed design;
FIG. 2 is a front view of a second embodiment of a display device with graphical user interface showing the claimed design;
FIG. 3 is a front view of the second embodiment thereof, shown in alternate environment;
FIG. 4 is a back view of FIG. 2;
FIG. 5 is a left view of FIG. 2;
FIG. 6 is a right view of FIG. 2;
FIG. 7 is a top view of FIG. 2; and,
FIG. 8 is a bottom view of FIG. 2.
The broken lines in the figures showing the display screen or portion thereof are for the purpose of illustrating environment, and form no part of the claimed design.