Highlight a Player
Open your Studio project and select the light beam icon from the 2D menu.
Click on the desired player to place a Light Beam on them.
Pro tip: Navigate to Studio > Preferences > General. From this menu you can assign objects to players feet instead of the body.
Use the three tabs on the right to customize the appearance of your light beam.
You can track the player with the light beam by clicking on the 3 dots to the right of the beam's row on the timeline, then select Track Full.