The format of fields can be changes on a field by field basis.
There are 3 field styles to choose from.
From the field add\edit screen, you can view the field options by pressing the small triangle at the top right.
Once visible, swipe left and right to change to the desired format.
The app settings allow you to set the defaults for each field type as well as reset all fields within a Lockr to specific layouts.
Also on the options screen is "Shake To Show". Any fields you mark with this flag will not be visible untin you shake your device. Consider it an extra layer of protection in case someone is looking over your shoulder.