How to disable Mobile Client 'Zoom out'

[PatrickS]

There's an auto-zoom-out effect on mobile devices during live chat and talk. Adding a specific tag to the webpage is said to resolve this issue. Does anyone know which tag to use or have any other suggestions?

<meta name="viewport"  content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"/>

Could anyone help me identify where to add those codes on the 3cx live chat?