Zoom for manual testing

[luprochazka-cen63872]

We use iPads Pro 12.9. The screen for manual control is too small. Yes, it is possible to use zoom of the browser, but I think, it would by much nicer to set the default size according to the device and also add zoom buttons.

[saikrishna321]

@luprochazka-cen63872 Can you please share a screenshot when you the manual controls are too small.