Editora 0.17.0. Archived, so links from that release keep working. Read the 0.18.5 page →
View: Toggle Split Preview
view.toggleSplitPreview Switch the current file between the editor and a split editor + preview view (Markdown, CSV, SVG, diagrams, and more).
How to run it
Open the command palette (M-x in the Emacs keymap) and search for View: Toggle Split Preview, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.