A spread instead of a cramped month
A two-page calendar is for people who outgrow a single Letter month. Appointments, meals, or classroom notes need height. Splitting the month at mid-month keeps weekday headers on both sheets so you still know which column is Thursday.
Print both pages in one dialog. The preview stacks the two sheets. Use the same paper size and week start on both; they come from the same form. Portrait Letter is the default. Landscape two-page is possible, but portrait usually gives more writing height, which is the reason to split the month.
Days from other months stay hidden on this layout, so each page is only the active half. If you need those gray overflow dates, use a classic single-page month with adjacent days turned on.
This is not a bound book and not a download of a designer’s spread. The generator builds two grids from the selected month. Leap-year February still includes the 29th; it will fall on the second sheet.
If you wanted two pages as “month plus a full notes page,” use a lined-notes month or print a blank week on the back of a single-page month. The two-page type here is a split month, not a notes insert.