We claim, the ornamental design for a display screen 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; and,
FIG. 2 is a detail view of the graphical user interface, shown separately from the display screen for clarity of illustration.
The broken line showing of the display screen is for environmental purposes only and forms no part of the claimed design. The dot dash line represents a boundary which is excluded from the claim.