Editora 0.18.0. Archived, so links from that release keep working. Read the 0.18.5 page →
Markdown: Zoom Out Preview
view.markdownZoomOut Zoom out the Markdown preview.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Markdown: Zoom Out Preview, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.