All such viewport settings will not prevent the input-focus zoom if you are zoomed-out. These will also not over-ride any other html, body, or element sizing that would push the window to width wider than the screen.

when you have problem click on input for searching and then it zooms your page.

follow below code to solve it and include on between html <head></head> .

<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">