Hi partner,
Apparently, it’s not really a tab on the form that we can customize the way we customize other tabs. It’s actually the old form navigation for related entities, which looks like a tab on the unified interface.

You can show or hide it in the form properties, but can’t rename it.

I also try to add JS to OnLoad event, it get error.
Because Id of the ‘Related’ isn’t constant, ‘Related’ on different form has different id, even it will change when to go into the same form once again.


so it can't be renamed.
Regards,
Leah Ju
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