After QUIC enabled, you don't need to manually do something. LSWS will automatically use QUIC when browser supported. If you want to know the difference between each Quic version, you can check google document. If you need something else, you can clarify a little bit more about "How to use Quick v44".
Seems QUIC not work on my end too. Could you verify if downgrade lsws server to previous version can make QUIC works again?
If so, please log a ticket to LiteSpeed or send to firstname.lastname@example.org