2. The 'FIND & REPLACE' button
Finds all of the 'find' phrases from the selected list in the current document, then replaces them with the corresponding 'replace' phrases.
If there is a selection, find and replace will only work on the selected text.
HINT: Because Multi Find & Replace does not allow you to step from one found phrase to the next (like you can when using the 'Find & replace' feature built into Google Docs), it is helpful to first do a simple 'Find' operation to highlight the found text, and then select the parts you actually want to replace before clicking 'Find & Replace'.