ufw status
ufw enable

sudo ufw allow 22/tcp
sudo ufw allow 4500/udp
ufw start

sudo ufw deny 41194/udp

ufw app list
ufw status
ufw status numbered
ufw delete 1

Links
https://linuxconfig.org/how-to-delete-ufw-firewall-rules-on-ubuntu-18-04-bionic-beaver-linux