A4 weekly schedule
A4 sheet, Monday start, hours labeled on the 24 hour clock from 07:00 to 21:00. The conventions most of the world outside North America uses.
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Three defaults changed from the Letter version
This is not simply the Letter sheet on a different size of paper. The hour labels read 07:00 through 21:00 rather than 7am through 9pm, the week starts on Monday, and the page is 210 by 297 millimeters. All three are the ordinary convention across Europe, most of Asia, Australia and much of Africa, and all three are switchable in the generator if your habits differ from your postcode. The 24 hour labels have a practical advantage beyond convention: they are a fixed five characters wide, so the time gutter can be narrower than it needs to be for a mix of 9am and 12pm, which gives the day columns a little more width.
Monday start is a written standard, not a preference
ISO 8601, the international standard that also gives us the year-month-day date format, defines Monday as the first day of the week. That is why calendars in most of the world start there and why the week number on a European wall planner counts from a Monday. The United States and Canada conventionally start on Sunday, along with Japan and a number of other countries, which is why the Sunday start version exists. Neither is more correct. It matters here only because a schedule with the wrong start day is subtly hard to read and people rarely work out why.
A4 is taller, which is where the benefit lands
A4 is 18 millimeters taller than US Letter and 6 millimeters narrower. For a schedule that trade goes in your favor, because the height is what becomes row height and the width is divided between seven columns, so the loss is under a millimeter per column while the gain is spread over fourteen hour rows. The same fourteen hour range comes out with noticeably more room to write per hour on A4 than on Letter. If you are printing this on a North American printer, check that the paper size selector says A4 as well as the file, since a mismatch there silently scales the page to about 94 percent and the hour rows come out shallower than intended. The calibration sheet will tell you in one page whether that happened.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.