The zoom function of the camera app on the Huawei smartphone comes with two different ways of zooming. The familiar two-finger pulling apart or pulling together to zoom in and out still works, while
the other method is to swipe the slider on the side of the screen.

Android 10 (EMUI 10.0)
Step 1:  Open the  Camera app
Step 2:  Swipe  upwards  to zoom in
Step 3:  Swipe  down  to zoom out
  1. Open the Camera app
  2. Swipe upwards to zoom in
  3. Swipe down to zoom out

Huawei Instructions
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