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					Originally Posted by  Agama
					 
				 
				These buttons only control the calibre library program, they do not have any effect on the E-book Viewer. I have launched the viewer in standalone mode and from the "View" button from within calibre but the toolbar, (with buttons for Increase/Decrease font size, Set Bookmark, Reference mode etc.), is still off. 
			
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 My mistake, You didn't do anything to switch off this toolbar.  The toolbar you're looking for doesn't exist when viewing LRF files.  LRF uses a different viewer and the toolbar is not present on the LRF viewer.  Open an ePub or a LIT file and I'm sure you will find the toolbar right where it should be.