This is implying that it’s in subjunctive mood. Why? Simple present tense is “sientas”. The confusion with 2nd person present indicative of Sentir (sientes) is totally avoidable. Probably a typo…
Don’t sit on it.
The negated imperative uses the subjunctive as a rule. Or am I missing something?
Thanks for that - obviously it was I who was missing the rule you shared!