Game mode not turning on for Mac when launching TML

I'm using macOS Sequoia 15.2 with an M1 Max chip, and I just realized my game gets super laggy because Game Mode doesn't activate when I launch TML. I’ve played way more CPU-intensive games without issues, so I’m pretty sure this is the cause.

Apple doesn’t let you turn on Game Mode manually (for whatever stupid reason), and the official site says it should turn on automatically when you go full-screen in a game. That works for Terraria and other Steam games but not for TML. Any help or solution? It gets so laggy that it's near impossible to play during boss fights or events.
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