Why adjust exists
Often the first reply has the right idea and the wrong feel. Too long for a text, a bit stiff for a friend, too soft for a client who keeps pushing. Rewriting it yourself takes longer than it should. Asking again from scratch loses the idea you liked.
Adjust keeps the move and changes how it sounds. The point of the reply stays the same. Only the delivery changes.
That matters because the move is the hard part. Deciding to say no but offer the pick-up is the judgement. So is holding your price while giving a later check-out. How many words it takes is just fit.
What each option does
Shorter cuts it to the line that matters. Good for texts and anyone who replies in three words.
Longer adds a reason or a detail, for when a short reply would read as cold or dismissive.
Warmer adds care: a thank you, a bit of feeling, an offer. For friends, family and anyone who is upset.
Direct takes out the hedging and says the thing plainly. For a no, a boundary or a deadline.
More casual loosens it up so it sounds like a message, not a letter.
More confident drops the apologies and the "just checking". Useful when you are asking for money, a decision or a date.
More professional tidies it for a client, a recruiter, your boss or a landlord without making it stiff.
You can stack them. Shorter then Warmer is a common pair for texts. Direct then More professional suits a firm email.