looking for the tabs

Hi everybody,

I have a problem with the software! I unfortunately clic on the "hide tabs" option, after a right clic on a document. And now, I can't find them anymore. it's very usefull when you have a lot a schematic and vhdl file opened, so please, tell me how make them appear again...

Tks!

PS : I know! I can uninstall and reinstall the quartus. but this is less fun!:p