Display panel or portion thereof with a graphical user interface

This application is related to U.S. patent applications Ser. Nos. 29/663,012, 29/663,017, 29/663,020, 29/663,023, and 29/663,027, filed on Sep. 11, 2018, and 29/703,757 filed on Aug. 29, 2019, and all entitled “Display Panel or Portion Thereof with a Graphical User Interface”. The content of the aforementioned patent applications are hereby expressly and fully incorporated by reference in their entirety, as though set forth in full.

FIG. 1 is a front view of a display panel or portion thereof with a graphical user interface showing our design; and,

FIG. 2 is a front view of a display panel or portion thereof showing the design of FIG. 1 in a different environment.

The outermost broken lines depict a display panel or portion thereof that forms no part of the claimed design. The remaining broken lines depicting portions of the graphical user interface and mixed reality environment are included for illustrating environment and form no part of the claimed design.