Display panel or portion thereof with a transitional mixed reality graphical user interface

[0001]FIG. 1 is a front view of a display panel or portion thereof with a transitional mixed reality graphical user interface showing a first image in a sequence of our design;

[0002]FIG. 2 is a front view of a display panel or portion thereof with a transitional mixed reality graphical user interface showing a second image in the sequence thereof;

[0003]FIG. 3 is a front view of a display panel or portion thereof with a transitional mixed reality graphical user interface showing a third image in the sequence thereof; and,

[0004]FIG. 4 is a front view of a display panel or portion thereof with a transitional mixed reality graphical user interface showing a fourth image in the sequence thereof.

[0005]The appearance of the image sequentially transitions between the images shown in FIGS. 1 through 4. The process or period in which one image transitions into another forms no part of the claimed design.

[0006]The outermost broken line rectangle illustrates a display panel or portion thereof that forms no part of the claimed design. The remaining broken lines, including all text, illustrate portions of the graphical user interface or a mixed reality environment, and form no part of the claimed design.