Editora 0.10.0. Archived, so links from that release keep working. Read the 0.18.5 page →
LSP: Signature Help
lsp.signatureHelp Show the overloads and the active parameter for the call at the caret (also pops up automatically when typing a call)
How to run it
Open the command palette (M-x in the Emacs keymap) and search for LSP: Signature Help, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.