Furthermore there is no unique value selection in the Dashboard query like in the web app builder. Meaning you can not set the query to have a drop down box with all values from the field. This would also be nice to have.
This one was implemented in the meanwhile. There is a settings "wheel" now next to the field where you can define if you want unique values or even values based on the query output of a previous query.
@Xuehan_HarveyJing What you are requesting is already possible via ArcGIS Dashboards' category selector. They can be configured to allow users to a single category (e.g. Wednesday) or multiple categories (e.g. Monday, Wednesday, Friday). by adjusting the Selection setting.
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