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== panel tooltips ==https://github.com/linuxmint/cinnamon/issues/4549Edit your cinnamon.css file of your theme, located in ~/.themes/your_theme/cinnamon/cinnamon.cssSearch (or create) this class : #Tooltip { background-color: rgba(0,0,0,0.0); color: rgba(0,0,0,0.0); }(display: none; doesn't work). Now the tooltip is fully transparent, so unvisible.The theme could also be in /usr/share/themes. Just check in the themes settings to find the name of the theme you are using.