Samsung's One UI user interface allows users to change fonts across the entire operating system. In addition to the standard Android font, the SamsungOne and Gothic Bold styles are available ex works, and other free and paid fonts can be downloaded/purchased from the Galaxy Store.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Font size and style
Step 4:  Tap on  Font style
Step 5:  Choose desired  Font style
  1. Open the Settings
  2. Tap on Display
  3. Tap on Font size and style
  4. Tap on Font style
  5. Choose desired Font style

Samsung Instructions