It's actually a restoration of an old feature. It's literally called SteamControllerRumbleIntensityV2.
This existed before the new Big Picture. It never stopped working for the 2015 controller. They removed it from the UI. But this new version supports the 2026 controller too.
I realllyyyy wish they maintained Steam Input better. The bones are amazing and what does work works really well but we're also missing a lot of important features that most other controllers already have in their own dedicated software. (For example, trigger and stick calibration). It's a little disappointing.
As far as I can tell, it's not a per game setting: it's global.
I changed it to Extra High, booted up Super Mega Baseball 3 to feel the feedback on baseball hits, which I had just been playing earlier and confirmed the bat hits had a much stronger rumble.
After that I immediately booted up Clair Obscur: Expedition 33 and the hits were considerably stronger than the last time I played.
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u/sqparadox Steam Controller (2015 & 2026) 7h ago
It's actually a restoration of an old feature. It's literally called SteamControllerRumbleIntensityV2.
This existed before the new Big Picture. It never stopped working for the 2015 controller. They removed it from the UI. But this new version supports the 2026 controller too.
Edit: And it's a per-game setting