Changing text notification settings

I’m on /e/OS 2.7 (Android 14) for FP4. I have some text conversations that can receive many distracting and even annoying replies in a short amount of time. I would like to have sound and / or vibrate still work for other things. I don’t see an option to mute the conversation, and the option to switch from default to silent notification is greyed and unresponsive. Individual toggles are also greyed and unresponsive. How could I enable muting or disabling sound and / or vibration for specific text conversations or contacts?

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Are you talking about the default SMS App of /e/OS or are you using any other text conversation App? Which one?