Recipe for butternut squash and sage lasagna by Penni asks for chopped sage in the direction but doesn’t say how much

This is step #15 .In a medium bowl, combine ricotta with egg yolks, chopped sage and grated Parmesan; taste and adjust seasoning with kosher salt, if needed.

This is where the question is about the chopped sage.

Hi Carmen, my recipe actually calls for just a large sprig of sage (with maybe 4-6 leaves) to be added to the milk while it simmers, so that the flavor will infuse the milk. You remove the sprig from the milk before you make the bechamel, so there's actually no chopped sage in the dish but the flavor will be there. Hope you like it!

Sounds like they wanted one sage leaf to flavor the sauce.
For similar recipes I’ve used a small handful (about 4) chopped up and left in the dish.
You may also use two or three whole leaves on top as a garnish and to suggest one of the flavors inside.