LOD was the momentary title to the "[wo]man in charge," the captain of the ship, the no-higher-than person in the building. They encompassed the manager on duty role. They were always a Sr. TL or ETL.
We did away with this in Modernization. There's no one supreme leader of the building at any one time. There are no Sr. TLs that outrank TLs but below ETLs. Your TL or ETL, if present, is your leader and that's who gives out instructions to you. They aren't in charge of the entire store, but they can certainly respond to requests for "a manager" by Guests.
The Closing Team Leader became the person responsible for the closing of the store (the key carrier) and does pretty much what the LOD did before during closing. Since these are mostly M-F roles, other TLs act as the closers in rotation.
But no there are no Leaders on Duty.