Not being able to find a good source for the topic, I will start this off with what I remember from someone talking his way through set-up in his CX-5.
This is becoming more relevant as Car and Driver magazine just listed CX-5 as one of it's Ten Best list.
Firmware 135.
I believe a good place to start, and reduce by 10% as needed until quiet:
K Narrow
Advanced K 50-70% start at 70 and lower by ten until happy.
Rear horn sensitivity 60%.(lower by 10 if required but remember Ka is affected too)
Rear K Mute only if necessary
K Filter On
TSF On
MRCD On as last resort or for other Mazdas
Quiet Ride 30 mph
Quiet Ride 1 beep: 1 or off
K Block 1 & 2 weak
Car and Driver: 10Best Cars and Trucks for 2021.
www.caranddriver.com
This is becoming more relevant as Car and Driver magazine just listed CX-5 as one of it's Ten Best list.
Firmware 135.
I believe a good place to start, and reduce by 10% as needed until quiet:
K Narrow
Advanced K 50-70% start at 70 and lower by ten until happy.
Rear horn sensitivity 60%.(lower by 10 if required but remember Ka is affected too)
Rear K Mute only if necessary
K Filter On
TSF On
MRCD On as last resort or for other Mazdas
Quiet Ride 30 mph
Quiet Ride 1 beep: 1 or off
K Block 1 & 2 weak
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Car and Driver: 10Best Cars and Trucks for 2021.

10Best Cars and Trucks for 2021
We cut through the crowded market to find the 10 vehicles that deliver incredible value and a great driving experience.