Hi @Phil Johnston
Smart Containers can only group by fields that are part of the linked dataset and schema. If a field isn’t appearing in the “Group by” dropdown, it means Lucidchart doesn’t recognize it as an available data attribute for those containers, either because it isn’t included in the data source, wasn’t part of the schema when the containers were created, or doesn’t contain usable values.
Kindly verify that the field exists in the container’s data panel and is populated consistently across the selected containers.
To learn more - Multiple set of smart containers grouped under multiple names | Community - it discusses how grouping behavior works for Smart Containers in Lucidchart, even though it isn’t directly about missing fields in the “Group by” dropdown. The way grouping works, and the limitations a user run into when organizing multiple Smart Containers from a single dataset,
Hope this helps - Happy to help further!!
Thank you very much and have a great one!
Warm regards