My s21 ultra hang sooo soo much its wrost uodate ever i wish they release beta 2

One ui 4.0 uses so much ram almost 7.4 gb even if only 1 or 2 application opened.

Where can i purchase SPEN for s21 ultra?????

I have s21 ultra. I got tempered glass recently now i can not able to put any fingerprint.my finger print lock can not work. I removed my fingerprint before i install glass. Now it does not scan my fingerprint what can i do??????