Open your AMD control center and do this
First click the Updates tab at the bottom left and make sure your graphics drivers are updated to 19.9.2  or higher and click express upgrade



Make sure High Performance is selected under Power Plan in Nitrosense when on AC



After that make sure your games are in listed under switchable gaphics and your games are set on High Performance, you must import your games .exe using the Browse tab in pic below



Lastly to run your game on the RX560x you must launch the game from inside the Radeon Adrenalin Control Center. Click the gaming tab then if your game is not there you will need to add your game's .exe by using the ADD button on the right and navigating to your games .exe file, then click the drop down box for your game then click launch. The game will now launch using the RX560x and it will be monitored in Nitrosense