Horizontal scrollbar in Item Pane

A scrollbar appears at the bottom of the Item Pane:
188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u265723/73apznxskrvx87382rc2.png

Resizing the Item Pane does not make it go away:
188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u265723/yevckq39biuza2tp870s.png

188BET靠谱吗Zotero 7.0.0-beta.117+794dc6bf0 (64-bit)
Windows 10
Sign Inor Registerto comment.