I'm drawing ERD diagrams in PGAdmin4. I can draw one to many relationship and a many to many relationship. But cannot do zero to many

Question

I want to draw different relationships between tables outside of 1 to many and many to many.

There are no tutorials or evidence of it anywhere.

Where is zero to many or zero or 1 to many or indeed 1 and only 1.

I am now writing text to fulfill the character limit.