Hi,
It should work if you set the layout property to "GridLayout":
<f:SimpleForm columnsL="1" editable="true" emptySpanL="4" emptySpanM="4" id="NewRequestform" labelSpanL="3" labelSpanM="3" layout="GridLayout" minWidth="1024">
The default is ResponsiveGridLayout and this results in arranging labels and input fields one below the other on phone devices (as you observed).
Best regards,
Sebastian