For future reference, embedding screenshots in Word documents isn't the more streamlined way of sharing information. The more effort people have to go through to see your examples, the less likely they will dig into it.
Looking at the screenshots, you appear to be using Arcade syntax while specifying Python as the parser. A Python version of your expression is:
(!DIRPRE! + !PROPER_NAM! + !ST_TYPE!).upper()
Hey Scott, sorry to hear this adding screenshots was not immediately obvious. Check out this document which will take you through the steps for any future images you want to add to a post.
Hope this helps.