(UPDATE: August 23, 2020) A list of all Looney Tunes shorts available from HBO Max. I'll do my best to keep up with additions/removals.
For a list of films available on HBO Max that are part of the Warner Bros. library (Warner Bros./MGM/RKO): HBO Max | Warner Bros. catalog
For a list of things on the TCM hub: HBO Max | TCM
For a list of Popeye shorts: HBO Max | Popeye
For a complete listing of available titles: HBO Max | Complete Collection