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 portions thereof with graphical user interface, showing our new design; and,
FIG. 2 is a front view thereof in an environment of use.
The broken lines are for environmental purposes only and form no part of the claimed design. The dot dash lines in the figures represent an unclaimed boundary line and form no part of the claimed design.