We claim the ornamental design for a display screen or portion thereof with graphical user interface, as shown and described.
The sole FIGURE is a front view of a display screen or portion thereof with graphical user interface showing our new design.
The broken lines shown in the sole FIGURE represent portions of the display screen or portion thereof with graphical user interface that form no part of the claimed design.
The outer edge of the portion of the display screen is understood to be congruent with the outer edge of the graphical user interface.