Bwidth: (up-down)/mid;

Besides, have you set the values of n and p? This should also be set. In parameter, the default value of n is generally 26, and the default value of p is generally 2!

As for the color setting, Wenhua doesn't do this, but you write a formula. When a question mark appears in front of bwidth, right click and an "indicator color" appears, and set it in "indicator color".

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I copied the following BOLL directly from "Wenhua", followed by the last formula. Click "Test Formula" to display success.

MID:=MA(CLOSE，N)；

TMP2:=STD(CLOSE，M)；

TOP:= MID+P * tmp 2；

Bottom: = mid-p * tmp2;

BWIDTH: (top-down)/mid;

Remember to fill in the parameters. N defaults to 26, m is also 26, and p defaults to 2!

Good luck!