refocusAll = function (group) {
    const charts = chartRegistry.list(group);
    for (let i = 0; i < charts.length; ++i) {
        if (charts[i].focus) {
            charts[i].focus();
        }
    }
}
Reset zoom level / focus on all charts that belong to the given chart group. If the chart group is
not given then only charts that belong to the default chart group will be reset.
@function refocusAll
@param {String} [group]
@return {undefined}