Editora 0.20.0. Archived, so links from that release keep working. Read the 0.24.0 page →
View: Toggle Symbol Index
view.toggleSymbolIndex Enable or disable the built-in project symbol index that backs Go to Symbol in Project.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for View: Toggle Symbol Index, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.