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 claimed design; and,
FIG. 2 is a front view of another embodiment of a display screen or portion thereof with graphical user interface.
The peripheral dashed broken lines illustrate a display screen or portion thereof, and form no part of the claimed design. The broken lines within the peripheral dashed broken lines illustrate portions of the graphical user interface which form no part of the claimed design.