In "Star Wars Jedi: Fallen Order," during the Journey+ mode (or New Game Plus), players can unlock the ability to wield different lightsaber colors, including a red lightsaber. However, the game does not restrict the red saber's usage to just holding it in front of cars; rather, you can use it in combat and other gameplay elements throughout the game.
If you're interested in the lore, red lightsabers are traditionally associated with Sith, but players can choose the color for aesthetic purposes in Journey+. Feel free to explore all the abilities and customize your lightsaber color according to your preferences!