We introduced in-game player scores as an optional feature in Custom/Skirmish matches in the Winter 2021 Update (or Update 8324). To activate in-game player scores, you’ll need to complete two key steps.
Step 1: In Settings > UI, please make sure “Show Pinned Player Information” is toggled to “On.” This will ensure your score and the score of other players or AI will show up in the event the Match Host activates the feature for a Custom or Skirmish game.
Step 2: If you have “Show Pinned Player Information” pinned to “On” and are the Match Host, you’ll need to select the option to Display Player Scores. This found under Match Options in the Custom lobby setup screen.