Hi @mdenman ,
As per our understanding You want to rename the Web Page Title that shows on the top of the tab,
Step 1: Navigate to the Web pages in Portal Management,
Step 2: Open the Web Page record,
Step 3: Navigate to the Localized Content for the Respective Web Page,
Step 4: Look for the title, Rename it.

Before adding changes the portal page is as follows:

After renaming the Title in Localized Content,

If this answer helps, please mark it as an Accepted Solution so it would help others to find the solution.
Thanks!
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