this is an example of the pages, with detailed maps that can be zoomed in , and I presume, printed.
https://en.eurovelo6-france.com/troncons/tours-saumur
In general though, the route is well marked, but having an idea of where you are going, and specifically, a printed page with it on , is sufficient to follow, depending on your navigation skills.
Thanks. I have looked at the website and zoomed in on the map. It was good enough to tell that Google maps was actually sending me on the bike route. And from zooming in on street view, I could actually see the signs that mark the route. I'm not too worried. We're not going until early September anyway.