async clickLeftMonthDay(day) {
        const buttonEl = await $(this.rootElement)
            .$$('table[role=grid]')[0]
            .$(`button=${day}`);
        if (await buttonEl.isExisting()) {
            await buttonEl.scrollIntoView();
            await buttonEl.click();
        }
    }
Clicks the specific enabled day button element on the left month.
@method