Please post all of your computer specs. If a laptop the exact Make & Model.
If this is a PC Computer and not a laptop, Check under Device Manager and make sure your RX 570 is recognized without any errors plus it isn't showing any Yellow exclamation marks.
Normally, when you install a Discrete GPU card with a motherboard with an APU (CPU with integrated Graphics), BIOS/UEFI will automatically switch from the Integrated Graphics to the Discrete GPU card making it the main Display for booting up.
Make sure your monitor is connected directly to the GPU Card and not the Motherboard Video outputs (Integrated Graphics).
Make sure you have the latest AMD Graphic driver for the RX 570:https://www.amd.com/en/support/graphics/radeon-500-series/radeon-rx-500-series/radeon-rx-570
Then you need to go in Radeon Setting Games and set up your Game so that it will use the GPU Card instead of the Integrated Graphics.
By the way, In your DXDIAG.txt all the errors showing for files having problems is related to your game RAINBOW 6.