Knowledge Base

I suppose that gtk3 is the reason behind LibreOffice's nerfed ability to display icons in the menu, but some enterprising netizen found the way to get LibreOffice to route around this terrible design decision.

You can force LibreOffice's menu icons on by visiting Tools -> Options dialog, LibreOffice -> Advanced -> button "Open Expert Configuration." This new dialog has a search box, where you enter iconsinmenu and set these values:

• ShowIconsInMenues: true
• IsSystemIconsInMenus: false

After a restart, you can see the icons in the menus!

References

Ripped directly from LibreOffice - show icons in menus - Linux Is The Future