Hello Kyle !
Thank you for posting on Microsoft Learn Q&A.
What you’re seeing is the new editor in the data and index explorer so each time you click a different document, the viewer instantiates a new editor so the find state doesn’t carry over and that’s why your search term no longer sticks from item to item even though it used to with the previous viewer.
You can use the edit filter or run a query so you only list documents that contain your term or use search history in the find box with Ctrl+F in the document then Alt+↑/Alt+↓ (or arrow keys depending on OS) to navigate through previous find terms. It’s faster than retyping, though still per document.