You want to change a project name throughout a document. The replacement tool can do it quickly, but speed is helpful only if it finds the occurrences you actually mean. Begin with the match, not the button that changes everything.
Inspect the first few results
Search for the old name and move through several occurrences. Is it also part of another word, a quoted passage or an address? A literal text match does not understand whether an occurrence belongs to the same concept.
Google’s find-and-replace guidance describes search options across its document tools. Available controls vary by application, so check scope and case settings in the tool you are actually using rather than assuming every editor behaves alike.
Try one replacement first
Use a copy or an appropriate version-history workflow for an important document. Replace a single occurrence and read the complete sentence. The new wording may need a different article, possessive ending or nearby reference even if the name itself is correct.
If the document contains quotations or historical names that should remain unchanged, a blanket operation may be inappropriate. Replace the relevant occurrences individually or narrow the scope using supported options.
Search again after the edit
Look for both the old and new forms. Review headings, tables and captions as well as ordinary paragraphs. Remaining old text may be intentional; changed text may still require grammatical repair.
The distinction between undo and version history matters if you need to recover an earlier state. Find and replace is a mechanical aid to a decision you have made, not a substitute for deciding which references should change.