Width Adjustment Has No Effect On Mobile Form

Width Adjustment Has No Effect On Mobile Form

I would like to adjust the width of a "Search and Auto-Complete" dropdown such that I can see all it's contents but adjusting the width in pixels on the field editor has no effect on the mobile platform.  Single line fields adjust to the width of the screen when switching from portrait to landscape on iphone.  If you can apply these same characteristics to the dropdown fields that would work great too.