This is the Sidebar position and it contains Widgets. These Widgets are assigned in one one or more overrides that are assigned in your page. You can use the Gantry Overrides Map widget, assign it in Drawer position and then visit your page.
This way you will find out which overrides are assigned there and edit them accordingly. Meaning that you will need to visit Appearance/Widgets, select the override at the top menu and then remove the Widgets from Sidebar.