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When I open a print composer in QGIS, all I see is my map. I do not see the item properties or command history. I can add a legend, scale bar, etc., but I can't edit them. I have not had this problem in the past.
Right-click anywhere on the toolbar in the Composer window, you should see a similar list of menus like below:
Enable the windows you want. The same windows should load up the next time you restart QGIS.
Required, but never shown