The ornamental design for a displayscreen or portion thereof with a graphicaluserinterface, as shown and described.
The FIGURE is a front view of a display screen or portion thereof with a graphical user interface.
The broken lines shown in the drawing illustrate a device and/or portions of the display screen or portion thereof with a graphical user interface that form no part of the claimed design.
Systems and user interfaces for dynamic and interactive table generation and editing based on automatic traversal of complex data structures including summary data such as time series data