When following Creating a UI Card to create a UI card, at "Select a Card Sample" field, the dropdown list show few items like "Adaptive Card Sample" as disabled status thus can not be selected. See following image as an example:
SAP Work Zone
SAP Business Application Studio - BAS
Object Card Sample, Analytical Card Sample, Component Card Sample, Calendar Card Sample, WorkZone Sample, selectable, gray out , KBA , EP-WZ-BAS-UIC , UI Integration Card Editor for SAP BAS , CA-UI5-IC-DT , SAP UI5 Integration Card Design Time , Problem
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