Editora 0.16.0. Archived, so links from that release keep working. Read the 0.18.5 page →
Diagram: Set Graphviz dot Command…
diagram.setDotCommand Set the path or command used to run the Graphviz dot executable.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Diagram: Set Graphviz dot Command…, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.