Help with justification?

[magicmuggle]

Hi. I need  some help on my journal even though the answer to this question is probably painfully obvious to most/all of you. I want to make the default font alignment of my journal justified (that is to say, all the lines of text end at the same place.) I realise you can just do this for each journal separately but I don't really want to do that if it's possible to make it a default. If it isn't possible then whatever.

If you're too lazy to check (lol) I have I have a Mixit style layout (the purple one with the grim reaper.)

Thank you in advance.