The Tabs legacy macros are a pair of macros used to preserve migrated tabs that you created with Content Formatting Macros for Confluence Server or Data Center. If your migrated content contains Tabs macros they will be rendered in the legacy macros.
Migrated Tabs Page and Tabs Container macros are rendered in Confluence’s legacy editor similar to the example below.
The legacy macro parameters are read-only. To add new tabs on a migrated page, use the Tabs Page macro.
Migrated Tabs macros are always rendered in a horizontal direction.