It's an Adventure, Charlie Brown (1983)

This hour-long anthology presents six animated shorts. "Peanuts" creator Charles Schulz appears on camera to introduce these adaptations of some of his favorite strips, which include Charlie Brown spending two unexpectedly pleasant weeks at summer camp; Peppermint Patty and Marcie taking jobs as golf caddies, with disastrous results; and Lucy trying to cure Linus' dependence on his security blanket.

Unfortunately the movie It's an Adventure, Charlie Brown is not yet available on HBO Max.