How is this effect done on Squarespace (See details)?

Question

Time Management

Scroll effect

Answer 1

If we are talking about the effect of "reducing" the picture, then the implementation can be found on the request "iMac scrolling effect". For example, there is such an implementation and its explanation .
And then, like, the usual parallax effect.
Judging by the code, they use a self-written solution, so there is no completely ready-made solution.