Display screen or portion thereof with transitional graphical user interface

Description

FIG. 1 is a front view of a first image in a sequence of a display screen or portion thereof with transitional graphical user interface, showing our new design;

FIG. 2 is a front view of a second image thereof; and,

FIG. 3 is a front view of a third image thereof.

The appearance of the display screen or portion thereof with transitional graphical user interface sequentially transitions between the images shown in FIGS. 1-3. The process or period in which an image transitions to another forms no part of the claimed design.

The outermost broken lines illustrate a display screen and form no part of the claimed design. The remaining broken lines, including the broken line showing of text, illustrate portions of a graphical user interface and form no part of the claimed design.

Claims

We claim the ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described.