The LDA is only a beep and can be turned off via a button on the steering wheel. Luckily it stays off. When it's active, it doesn't interfere with the steering, so it's more of a nag than a nanny. And you can tell the nag to shut up.

Unfortunately the TSS (real nanny) needs to be turned off each time the car starts. It's a series of menu commands.

I have had this come one once where some @&$*$ brake checked me. Sorry no sound. I keep it off so people don't hear me cussing at people like this.
6DGP307 BMW X1 SanJose - YouTube

I read the situation long before the TSS activated. When it came on and just beeped at me. Probably because I was already hard on the brakes. At the point the TSS came on it was more startling than the guy in front of me.

Personally, when I drive I focus on the task at hand and find all the beeps and lights distracting. That's just me though.

How did you get the TSS (PCS) to turn off permanently? My 2020 doesn't do that.

My owner's manual says:

The system is automatically enabled each time the engine switch is
turned to the “ON” position (vehicles without a smart key system) or the
engine switch is turned to IGNITION ON mode (vehicles with a smart
key system).

However, I can change the timing of the PCS and it will be persistent after the engine is restarted.

The pre-collision warning timing can be changed on (P. 96) of
the multi-information display.

The operation timing setting is retained when the engine switch is
turned off.