The ornamental design for a displayscreen or portion thereof with transitional graphical user interface, as shown and described.
FIG. 1 is a front view of a first image in a sequence for a display screen or portion thereof with transitional graphical user interface according to a first embodiment; and
FIG. 2 is a front view of a second image in the sequence thereof.
FIG. 3 is a front view of a first image in a sequence for a display screen or portion thereof with transitional graphical user interface according to a second embodiment; and
FIG. 4 is a front view of a second image in the sequence thereof.
FIG. 5 is a front view of a first image in a sequence for a display screen or portion thereof with transitional graphical user interface according to a third embodiment; and
FIG. 6 is a front view of a second image in the sequence thereof.
FIG. 7 is a front view of a first image in a sequence for a display screen or portion thereof with transitional graphical user interface according to a fourth embodiment; and,
FIG. 8 is a front view of a second image in the sequence thereof.
The appearance of the claimed design transitions between the images shown in FIGS. 1 to 2, between the images shown in FIGS. 3 through 4, between the images shown in FIGS. 5 through 6, and between the images shown in FIGS. 7 through 8, respectively. The process or period in which one image transitions to another forms no part of the claimed design.
The outermost broken line rounded rectangle showing an electronic device illustrates environmental subject matter. The broken line showing a display screen, and all other broken lines showing portions of the graphical user interface illustrate portions of the article. None of the aforementioned broken line subject matter forms part of the claimed design.