edit build.prop in system folder using a file manager with root privileges,
search for this line --> ro.sf.lcd_density=240, change the value as you like,
set permission to -rw-r--r-- and reboot.
to obtain more space you need to decrease the value (ex: ro.sf.lcd_density=192)
Motorola Atrix 4G
LG P760 (V20 EU)