Editora 0.10.0. Archived, so links from that release keep working. Read the 0.16.0 page →
Buffer: Close Other Tabs
buffer.closeOthers Close every tab except the current one.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Buffer: Close Other Tabs, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.