#1

I set the interface type to number and the DEFAULT_SETTINGS to 0, but the default value for it appears as 50.
Also, .setLimits(0, 10, 1) shows a default value of 10. Perhaps the default value is fixed at 50?

#2

Hmmm, this worked for now.

addSlider((cb) => {
        let value;
        if (settings_value) {
          value = settings_value;
        } else {
          value = default_value;
        }
        cb.setValue(value)
#3

I found the cause.
So far, I have done the following.

export interface Set1 {
  slider:number;
}

export interface MySettings {
  set1:Set1
}

export const DEFAULT_SETTINGS: MySettings = {
  set1: {
    slider: 0
    }

When I changed it this way, it recognized the DEFAULT_SETTINGS.

export interface MySettings {
  set1_slider: number;
}

export const DEFAULT_SETTINGS: MySettings {
 set1_slider: 0
}