Hi I'm using the filter widget in ArcGIS Experience Builder. When setting the filter up, I'm asking the user to select a value from a pre-defined list in a drop down box. So in the SQL wizard under 'select source type' I'm selecting 'Unique - pre-defined'. And in the next step to predefine unique values, I'm selecting the default 'all'. This gives an SQL statement as '(Type = ?)'. However, when checking the filter box in the preview, the selection box is just populated with 'all'.
As an update to this, in the SQL expressions I am selecting 'is' as an operator, then I notice that under 'select source type', the multiple (pre-defined) option is missing.