IonContent elements cannot pinch in on ios device

I create Ionic React app and I am trying to pinch in from “IonContent” element but It can’t work by ios device. Works well on android device and to pinch in the part of “IonHeader”
How to solve it. below is my app viewport setting of “index.html” source code.If you need other code please let me know. Would you please teach me the solution?

Here is “index.html” viewport setting

      content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=3.0, user-scalable=yes"