Ability to set any row or column to be a header in tables

Issue Summary

In the Confluence new editor, it's no longer possible to set any row or column to be a header. It was formerly possible in the legacy editor.

Steps to Reproduce

1. Create a table in the Confluence new editor.
2. Select a row or column in the middle of the table.
3. Select Table Options drop-down and select Header Row or Header Column.

Recording #3.mp4

Expected Results

It's expected that the selected row or column would become the header.

Actual Results

The selected row or column does not get changed into a header, it only toggles the first row/column on and off.

Workaround

No current workaround.