how do i unfold the entire family tree, without having to click on every single arrow?

By using the fan chart …?

I'm guessing that you're talking about either the landscape or portrait pedigree views, which only show up to the 8-person generation (which is grandparents in the landscape view, since it shows both you and your spouse, but is great-grandparents in the portrait view, since it only shows your ancestors). I'm sure there are tradeoffs that make the use of these charts useful for some people, but I prefer the profile detail pages for the detail work and the fan chart (or very occasionally the descendancy chart) for an overview.