SELECT 'hello' AS x, (1 AS a, 'world' AS b) AS t

Was like:
   ┌─x─────┬─t───────────┐
1. │ hello │ (1,'world') │
   └───────┴─────────────┘
   
Now:
  ┌─x─────┬─t─────────┐
  ├───────┼─a─┬─b─────┤
1.│ hello │ 1 │ world │
  └───────┴───┴───────┘

SET output_format_pretty_display_footer_column_names_min_rows = 0, output_format_pretty_display_footer_column_names = 1;
SELECT 'hello' AS x, (1 AS a, 'world' AS b) AS t
   ┌─x─────┬─t─────────┐
   ├───────┼─a─┬─b─────┤
1. │ hello │ 1 │ world │
   ├───────┼─a─┴─b─────┤
   └─x─────┴─t─────────┘