Editora 0.18.3. Archived, so links from that release keep working. Read the 0.18.5 page →
Run: Save Run Configuration…
run.saveConfig Save the active file's main class as a run configuration.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Run: Save Run Configuration…, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.