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 outer broken lines showing the display screen or portion thereof form no part of the claimed design. The remaining broken lines in the FIGURE depict portions of the graphical user interface that form no part of the claimed design.
The dot-dash broken lines in the FIGURE illustrates bounds of the claimed design and form part thereof.