The ornamental design for a displayscreen or portion thereof with graphical user interface, as shown and described.
FIG. 1 is a view of a display screen or portion thereof with graphical user interface, showing our new design according to a first embodiment; and,
FIG. 2 is a front view of a display screen or portion thereof with graphical user interface showing our new design according to a second embodiment.
The outermost broken lines in the figures illustrate a display screen or portion thereof, and form no part of the claimed design. The remaining dashed broken lines in the drawings illustrate portions of the graphical user interface that form no part of the claimed design.