async moveHandle(where, which = this.WEST) {
    I.scrollPageToTop();
    const handlerBBox = await I.grabElementBoundingRect(this[`_${which}HandleSelector`]);
    const overviewBBox = await I.grabElementBoundingRect(this._overviewSelector);

    I.moveMouse(handlerBBox.x + handlerBBox.width / 2, handlerBBox.y + handlerBBox.height / 2);
    I.pressMouseDown();
    I.moveMouse(overviewBBox.x + overviewBBox.width * where, overviewBBox.y + overviewBBox.height / 2, 3);
    I.pressMouseUp();
  }
Move overview handle by mouse drag
**should be used inside async with `await`** operator.
@param {number} where - position between 0 and 1
@param {"west"|"east"} [which="west"] - handler name
@returns {Promise<void>}

@example
await AtTimeSeries.moveHandle(.5, AtTimeSeries.WEST);