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Advanced TAB >> select "toolbars"
the top panel "toolbar setup" should show the custom toolbars and the micro menu should be there.. just select and delete the micro menu, or you can select and apply your preferred default one, which would leave the micro menu able to be selected again later if preferred
if it's not there (in preferences panel) , then you can delete the "WebDev_Toolbar_Micro_V1.2.ini" file directly from your Opera Profile Directory