hideIndicator(id) {
		const indicatorElem = indicatorDiv ? indicatorDiv.querySelector('span[data-indicator="%s"]'.format(id)) : null;

		if (indicatorElem == null)
			return false;

		indicatorDiv.removeChild(indicatorElem);
		return true;
	}
Remove a header area indicator.

This function removes the given indicator label from the header indicator
area. When the given indicator is not found, this function does nothing.

@param {string} id
The ID of the indicator to remove.

@returns {boolean}
Returns `true` when the indicator has been removed or `false` when the
requested indicator was not found.