Hi themodeller,
Welcome to Talkgraphics!
The quick answer to your question is yes. You can justify text in Designer Pro. Note however that Designer PRO doesnīt support hyphenation. So it will be hard to format a block of text as it should be done at a professional level unless you do it manually, which is very time consuming and not practical in daily use, not to mention almost impossible for long text documents.

Iīve been requesting this feature for some time now, but i have no idea if itīs being considered for implementation or not.