try using the vita's mouse via the front touch pad. that lets you select any hud object you want. as for clearing the ui, im not sure it can be done via a setting or control short cut. also remember not every feature we have on th dual shock controler will translate over to the vita.

i will say however if you use the ps4 dualshock on the ps3 while playing this game the share button become select. id love to be able have the select button on the vita as a select button when linked. and be able to map something else to share.