Opening one section by default in Table/6 component

A community member is using the Table/6 component with foldable/unfoldable groups, and they want to have just one group opened at the start. They are looking for a class to add or something to change in the Interactions panel to achieve this.

In the comments, another community member asks the original poster to share a read-only link, but the original poster responds that they have changed their mind on the table they wanted to use, so the problem is no longer an issue.

There is no explicitly marked answer in the comments.