Why did you change the "Return to Family Tree" button to "Return to Record". It makes no sense.
Does it matter? Assuming you are talking about adding sources to an ID, the source linker process opens in another tab, so the Person page is still there when that page (with "Return to Record") is closed.
However, I do agree this makes no sense, when there is the "Go to: Record" option at the top of the page, which has the same function as "Return to Record".