Editora 0.9.10. Archived, so links from that release keep working. Read the 0.20.0 page →
Editor: Set Indent Style…
editor.setIndentStyle Set the global indent style: detect from the file, spaces, or tabs.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Editor: Set Indent Style…, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.