the text size is usually determined by the web pages. sometimes it may be too big, sometimes too small. in the Samsung browser, we also have the option of adjusting the text size to our perception. to do this, we can change the display size between 50 and 200 percent, whereby 100 percent corresponds to the specified size of the web page.

Android 10 (One UI 2.0)
Step 1:  Open the Samsung  Internet  Browser
Step 2:  Open the  menu
Step 3:  Tap on  Text size
Step 4:  Adjust the  text size
Step 5:  Confirm with  OK
  1. Open the Samsung Internet Browser
  2. Open the menu
  3. Tap on Text size
  4. Adjust the text size
  5. Confirm with OK

Samsung Instructions