If you enable this, you will have a button in the accessiility menu to enlargen whatever is shown on your display by tapping it.

Android 9
Step 1:  Open the  settings
Step 2:  Tap on  Accessibility
Step 3:  Tap on  Magnification
Step 4:  Tap on  Magnify with button
Step 5:  Activate or deactivate  Magnify with button
  1. Open the settings
  2. Tap on Accessibility
  3. Tap on Magnification
  4. Tap on Magnify with button
  5. Activate or deactivate Magnify with button

Android Instructions
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