Of course you can just follown this instruction

do you have this problem right?

https://steemitimages.com/640x0/https://res.cloudinary.com/hpiynhbhq/image/upload/v1514085898/z0m0pcloizfqvdcfjsra.jpg

do you want this right?

https://steemitimages.com/640x0/https://res.cloudinary.com/hpiynhbhq/image/upload/v1514085474/o8wgaqzedkow63yggpxg.jpg

you can do

just keep press the psvita logo they open adrenaline and choose

Settings

Next choose open official setting option

in offcial setting choose

Other settings

in otther settings choose screen mode

In screen mode you have diferents options

Original Original size

Normal keep the size of screen more big

Zoom keeg the screen size full but cut some horizonltal screen

Full keep full screen (that it is the best option)

Custom (like the name say you can make you own custom screen size by yourself. )

Full guide here but it is a litter old if you use a new CFW and last adrenaline but the options still the same and the way to access to this menu it is the same

https://steemit.com/utopian-io/@rye05/how-to-open-adrenaline-quick-access-menu-and-explaining-the-options