Web info says plenty that does not exist. Eg Showing a context menu with "Delete selected" The web says can delete emails with delete or shift delete. It crosses the text out BUT does not delete any emails. Similarly emptying the spam folder is supposed to happen off the right click context menu. Nothing happens except last entry is highlighted.

Ideally I want to select a group of emails in the inbox with the find option then ctrl/A to select them all then delete key to clear them from the inbox. NB. None of these emails are still on the server, just in thunderbird.