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The description is vague so please pardon.
It might be from the 1970's or earlier.
The story focuses on one protagonist in a bleak future society. It seems everyone is forced to spend time sitting and watching a large screen or TV of propaganda as I think it takes place in a theater except really large. The protagonist wants to break away from viewing, but can't. I'm not sure, but this viewing may be the way the masses are controlled, or it may be their only outlet from work or life.
Maybe The year of the sex olympics, a television play from 1968?
Plot summary from Wikipedia:
In the future, society is divided between 'low-drives' that equate with the labouring classes and 'hi-drives' who control the government and media. The low-drives are controlled by a constant broadcast of pornography that the hi-drives are convinced will pacify them, though one hi-drive, Nat Mender, believes that the media should be used to educate the low-drives. After the accidental death of a protester during the Sex Olympics gets a massive audience response, the co-ordinator Ugo Priest decides to commission a new programme. In The Live-Life Show, Nat Mender, his partner Deanie and their daughter Keten are stranded on a remote Scottish island while the low-drive audience watches. Mender's former colleague, Lasar Opie, feeling that "something's got to happen", decides to spice up the show by introducing a dangerous element to the island, and The Live-Life Show is deemed a triumph.
This 1968 television play inspired an episode of Black Mirror in 2011, Fifteen million merits.
I haven't seen the 1968 television play, but I've seen the Black Mirror episode, and it matches your description extremely well.
A Stanley Kubrick film. Starring Malcolm McDowell, Patrick Magee etc..
Alex (Malcolm McDowell), the central character, is a charismatic, antisocial delinquent whose interests include classical music (especially Beethoven), committing rape, theft, and ultra-violence. He leads a small gang of thugs, Pete (Michael Tarn), Georgie (James Marcus), and Dim (Warren Clarke), whom he calls his droogs (from the Russian word друг, which is "friend", "buddy"). [.....]
After it was cited as having inspired copycat acts of violence, the film was withdrawn from British cinemas at Kubrick's behest, and it was also banned in several other countries. Later gaining a cult following it has been re-released there.
Wikipedia 2023.
By Box Office Mojo, Fair use, https://en.wikipedia.org/w/index.php?curid=56677118
Alex is convicted of murder and sentenced to 14 years in prison. Two years into the sentence, Alex eagerly takes up an offer to be a test subject for the Minister of the Interior's new Ludovico technique, an experimental aversion therapy for rehabilitating criminals within two weeks.
Alex is strapped to a chair, his eyes are clamped open, and he is injected with drugs. He is then forced to watch films of sex and violence, some of which are accompanied by the music of his favourite composer, Ludwig van Beethoven. Alex becomes nauseated by the films and, fearing the technique will make him sick upon hearing Beethoven, begs for an end to the treatment.
It sounds a little like the excellent 1984, although the scenes where they watch the tele-screen on mass aren't necessarily on a large (cinema style) screen:
In 1984, civilisation has been ravaged by world war, civil conflict, and revolution. Airstrip One (formerly known as Great Britain) is a province of Oceania, one of the three totalitarian super-states that rule the world. It is ruled by "The Party" under the ideology of "Ingsoc" (a Newspeak shortening of "English Socialism") and the mysterious leader Big Brother, who has an intense cult of personality. The Party brutally purges out anyone who does not fully conform to their regime, using the Thought Police and constant surveillance through telescreens (two-way televisions), cameras, and hidden microphones. Those who fall out of favour with the Party become "unpersons", disappearing with all evidence of their existence destroyed.
