Editora 0.11.0. Archived, so links from that release keep working. Read the 0.18.5 page →
Bookmarks: Clear in File
bookmarks.clearFile Remove all bookmarks from the current file.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Bookmarks: Clear in File, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.