Taps Notes et attachments disappeared (version 2.0b7.2)

Hello
I work for some time with Zotero for my french thesis. Thank you for this excellent ressource !
I downloaded the last version 2.0b7.2 and the tabs "notes" and "attachments" in the Items have disappeared : I don't find how them reappear: Is this a bug in this version ? Because they were there in the previous version I had (2.06 I think)
Thank you for your future help

(and sorry for my english)
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