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, according to an embodiment; and,

FIG. 2 is a front view of a second image in the sequence of the display screen or portion thereof with transitional graphical user interface, according to the embodiment.

The outermost broken-line perimeter illustrates a display screen and forms no part of the claimed design. The remaining broken lines illustrate portions of a graphical user interface and form no part of the claimed design. The process or period in which one image transitions to another image forms no part of the claimed design.

Claims

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