You can use find and replace in Google Docs to find a word in a document, to replace a single entry, or to replace every instance of a word or phrase.
You can find text in PowerPoint on any version of the software, though the method varies on desktop and mobile.
Word’s testing a new default that saves fresh documents to OneDrive with autosave active. It’s convenient and good for recovery, but it also nudges more files into the cloud unless you opt out.