"In Freemasonry, the Tyler, also known as the "Outer Guard," is an appointed officer responsible for guarding the lodge’s meetings against unauthorized individuals, such as cowans (uninitiated or unqualified persons) and eavesdroppers.

The Tyler sits outside the closed door of the lodge room, typically armed with a ceremonial sword, to ensure that only duly qualified Masons are allowed entry. This role is critical to maintaining the security, privacy, and sanctity of Masonic proceedings."

The sword is ceremonial. It doesn't actually function as a weapon.

https://masonicfind.com/the-role-of-a-tyler-in-freemasonry