How does RGB(A) pen work?

[mobility212]

Welcome to Snap! Forum! Also note that

@random-account67571

I selected "help", but nothing popped up

Not every block has a help screen for it. Some intermediate blocks still need a polished help screen designed by the community.

@bh

it hasn't happened for the same reason the manual isn't up to date: I haven't been getting anything done for the past several years. Entirely my fault.