Hi,
Appreciate this was marked “solved” but it really wasn’t.
Without SSH, to remove nodes that are “in use” (in my case duplicate names in packages i was testing), go into visual code server: Home Assistant Community Add-on: Visual Studio Code
Go through package.json, package_lock.json, node_modules, nodes and remove reference to the package you dont want.
restart the node red instance from the addons page.
You will have removed unwanted “in use” nodes. This will break your set up if the nodes are legitimately in use, for me they were duplicate names and it was fine.