The ornamental design for a displayscreen or portion thereof with graphical user interface, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
The sole FIGURE shows a display screen or portion thereof with graphical user interface showing our new design.
The peripheral dashed broken lines illustrate a display screen or portion thereof and form no part of the claimed design.