One of life’s current mysteries is how to edit Cinnamon’s menu system in Linux Mint Version 19 (Tara). The trick is either to run cinnamon-menu-editor in Terminal or navigate to Menu – Right-click – Configure – Menu – Open the menu editor. (Note the link at the bottom of the first section – Layout and content – of the window.)
Then the next question is how to remove one of the icons that are docked on the left side of the start menu. In my case, I have replaced Firefox with Opera so I don’t need the launch icon for Firefox in the top-left corner of the default start menu. While not intuitive, the solution is actually very simple – just drag the icon over top of the application menu and release it. The icon disappears. Magic!
CINNAMON-MENU-EDITOR MAN PAGE
How to add a shortcut to a command to the Cinnamon menu?
How can I remove ‘docked’ items in the Cinnamon menu (“start”) bar on Linux Mint?