Polymerizes chitin, a structural polymer of the cell wall and septum, by transferring the sugar moiety of UDP-GlcNAc to the non-reducing end of the growing chitin polymer. [(1->4)-N-acetyl-beta-D-glucosaminyl](n) + UDP-N-acetyl-alpha-D-glucosamine = [(1->4)-N-acetyl-beta-D-glucosaminyl](n+1) + H(+) + UDP Induced by the antifungal agent caspofungin. Abnormal capsular morphology: abnormal fiber distribution, decreases capsular diameter (PubMed:32743128). Decreases extracellular vesicle secretion (PubMed:32743128). Belongs to the chitin synthase family. Class III subfamily.