Editora 0.20.0. Archived, so links from that release keep working. Read the 0.24.0 page →
File: Cancel PDF Export
file.cancelPdfExport Stop the PDF export that is running in this window and any queued behind it.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for File: Cancel PDF Export, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.