On most models, the default browser is set to "Samsung Internet", and when you open web pages, they are displayed with the Samsung Internet browser.

If you want to use Google Chrome, Firefox, Opera, Safari or other browsers alternatively, you can do so at any time. Usually, when you open the browser for the first time, you will be asked whether the browser should be set as default. If not, you can change the default browser at any time in the preferences.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Apps
Step 3:  Open the  menu
Step 4:  Tap on  Default apps
Step 5:  Tap on  Browser app
Step 6:  Choose desired  Browser
  1. Open the Settings
  2. Tap on Apps
  3. Open the menu
  4. Tap on Default apps
  5. Tap on Browser app
  6. Choose desired Browser

Samsung Instructions