Hello @felmue
Thank you for reading my bad English.
And the idea of touching the lower rim of the display is good.

However, it is a mystery whether there is a built-in sensor only at the position of the microphone hole at the bottom left.

The documentation I wrote in the first post can be found on this page ( https://docs.m5stack.com/en/core/CoreS3 ) under the link "CoreS3 User Guide".

The direct link is here ( https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/products/core/CoreS3/CoreS3 Development Kit-compressed (1).pdf ).

Thanks
chama

Page 7 of the CoreS3 document "CoreS3 Development kit.pdf" contains the following information.
**
Covering most of the from is the capacitive multitouch screen sensor with three dedicated touch zones available in code as buttons A, B and C.
These are not clearly marked as zone A shares the same location and the left microphone,
Zone B shares the same location as the camera and zone C shares the same location as the right microphone.
**
However, there is no mention of CoreS3 in the comments on M5Unified's Button.ino.
I actually tested Button.ino and it doesn't work.
That's why I thought CoreS3 was not equipped with virtual buttons.

But when I test the code below,

#include <Arduino.h>
#include <M5Unified.h>
void setup() {
   auto cfg = M5.config();
   M5.begin(cfg);
}

void loop() {
   M5.update();
   if(M5.Touch.isEnabled()){
     auto t = M5.Touch.getDetail();
     auto p = t.isPressed();
     auto r = t.isReleased();
     auto h = t.isHolding();
    
     auto x = t.base_x;
     auto y = t.base_y;
     M5.Display.setCursor(0,0);
     M5.Display.setTextSize(2);
     M5.Display.printf("x=%4d y=%4d PRH=%d %d %d",x,y,p,r,h);
   }
   delay(1);
}

When you touch the Zone A area, x=80, y=2000 will be displayed.
Pressed Released Holding is also displayed correctly. In other words, it seems that only button A is implemented.
When I touch Zone B or C, it doesn't respond at all.

What does this mean?
Is there any official comment on this?