Jenkins interface is targeted for desktop browsers, with large screens and mouse pointers.

Frequently I use Jenkins via mobile devices with 4" screens and I need to zoom in and out to be able to read and click.

I suggest to tune the UI to adapt to small/medium/large screens.

The layout changes needn't to be radical. Just being able to flow the screen vertically and allow the elements to be shrinked horizontally to fit on small device screens help a lot.