How we can edit blocks (fit: white and text: black) for monochrome printing.
For example, using AI2 offline (editing JS, CSS files...) ...
as discussed here
https://community.appinventor.mit.edu/t/how-to-edit-blocks-design-and-block-colors-in-ai2-at-localhost/19952
https://community.appinventor.mit.edu/t/how-to-change-block-color-of-own-appinventor/41221