How do I set my primary display video card?

Some computers may have two graphic cards: one built into the motherboard, and another dedicated video card for high-end video display. If you have multiple video cards the game may be playing on the built-in video card, which is often not as good as a dedicated video card. Setting a primary display card will force the computer to use the card you chose when playing.

Nvidia

1. Right-click your desktop.

2. Select NVIDIA Control Panel
3. On the left-hand side select 3D Settings
4. Select Manage 3D Settings
5. Click the Program Settings tab.
6. Select the game (Fortnite, Rocket League, etc.) from the drop-down menu.    
   Note: If it is not in the list, click the Add Application button and select the *.exe file of the game from the game's installation directory. This adds the game to the list and you'll be able to select it afterwards.
7. For OpenGL rendering GPU, select the primary graphics card (i.e. GeForce RTX 2080)

AMD

1. Right-click your desktop
2. Select Radeon Settings
3. Click references
4. Select Additional Settings
5. Select Power
6. Select Switchable Graphics Application Settings
7. Select the game (Fortnite, Rocket League, etc.)  from the list of applications.
   Note: If it is not in the list, click the Add Application button and select the *.exe file of the game from the game's installation directory. This adds the game to the list and you'll be able to select it afterwards.
8. Under Graphics Settings set the High-Performance profile to the game