On export submissons: the width of the forms-filter dropdown

I've searched the forum but with no luck so far:
A client has various forms on his website. Now, when he want to export submissions from a certain form, the form-filter is to small to identify the right form an he is forced to click through:

How can I make this list (with CSS) about twice as wide?
(in /administrator/components/com_baforms/assets/css/ba_admin.css)

Thanks in advance

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