The "Remove mode" does it exactly what it says on the tin. If you want to remove something from your page - enter this mode.
Removing Plugins
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Select the
"Remove mode" icon in the shape of a trash can from the left hand side icon bar.Choose the area/plugin on the page that you want to delete, select this plugin and then select "Yes, remove plugin!" to remove the plugin. Please note that this will delete the plugin on the page in the preview mode, if you change your mind and want the plugin back select the "Undo" icon in the top admin bar.
To go ahead with the removal of the plugin then select the "Save" icon in the admin top bar.