How to make drop down menu in multiple columns?

Need to make drop down menus in 3 columns by 9 rows
Tried to do as described here , but I get that all the paragraphs are jumbled and the area itself for not expanding on 3 columns
July 8th 19 at 15:28
1 answer
July 8th 19 at 15:30
perhaps this property will suit you: column-count

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