Workarounds to avoid cropping:
a CSS snippet:
.mermaid svg {
width: 100%;
height: auto;
}
(from Resize and align mermaid diagrams - #12 by Nilat )
or, create the mermaid in one note (e.g. mermaid_note) and embed it in another like so ![[mermaid_note]], and this will allow for scrolling left and right to see full graph.