Where do you see a Pro plan? Their pricing[0] lists a 10 documents limit for the free Individual plan and unlimited for the paid plans Team and Enterprise.
I see a 10 document limit for the Team plan when I open that page.
Their pricing-site is just broken. You get the 10 Documents for teams on mobile or when you shrink the window on desktop small enough to force the side into a vertical(?) view of the blocks.
Thanks for pointing this out, we'll get it fixed (the desktop version is the correct one).