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					Originally Posted by odamizu  Not sure about Windows or Linux, but on Mac, the epub version is shown in the title bar, e.g., "Sigil_User_guide_2021.03.15.epub - epub2.0  - Sigil"
 
Converting epub2 to epub3 is done with KevinH's nifty ePub3-itizer plugin  | 
	
 Ah, yes. There is it in the header. I was staring at the menus and didn't look there. 
 
Thanks for the pointer to the ePub3-itizer plugin. I will go take a look. I am writing a book that I might want to translate.