hello i searched in wiki i could not find anything about this
i installed gnome version but it is not satisfying at all and i want to change the interface to xfce how can i do that?
Search the forum. There have been a number of similar topics lately.
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I would suggest to clean install, because many of your Gnome configs are stored in your $HOME and some of them may (or may not) differ in the other edition's default configs.
A fresh install would make my mind think fresh 
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This applies in general to switching DEs.
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