Theres this nifty UI feature that lets you do just that.
Drag your finger up or down then, voila!
you might zoom in and out like you normally would with two fingers.
This trick works on either iOS, iPadOS, or Android.
Its already has been implemented for quite some time for years even though not many people know about it.
Why is this gesture useful?
Simple, you only need to use your thumbmostlywhile holding the phone with one hand to do this trick.
Other Devices
This gesture, however, does not work with the web program atmaps.google.com.
Note that this feature is not exclusively available for Google Maps.
Well let you know that this feature also applicable in Apple Maps for iPhone.
It essentially works the same way.
you’re free to directly use your thumb or any other finger to zoom in and out.
This gesture also works for some other apps on both Android and iOS.
For example, the zoom feature when using your phone camera app.
This method is proven to work on an Android equipment.
Zoom in Gallery
you might also use this gesture when viewing pictures in your gallery.
Most apps that have a zooming tool implemented within has a decent chance of having this feature.
While were at it, theres also another hidden feature that might come in handy.
This feature lets you zoom out by tapping the screen once with two fingers.
Theres a bunch of other features that smartphone vendors dont straightforwardly share with their customers.
