How to add multiple field filters?

When i add a new variable,the filter box appears,now the type of the new variable “Agent” is “文本”,the Chinese in English is “text”. But if i change the “Agent” type to “字段筛选条件”,the Chinese in English is “field filters”,the filter box disappears。Why?
The type of variable “DATE” and “PROVINCE” are field filters.

Hi @Bayes
Make sure that Agent in the Admin > Data Model is one of these Field Types: