Editora 0.9.10. Archived, so links from that release keep working. Read the 0.18.5 page →
View: Toggle Note Indicators
view.toggleNoteIndicators Show or hide the gutter glyphs and highlights for personal notes.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for View: Toggle Note Indicators, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.