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Where the f--- is the color replacement tool? I don't see it under the "brushes" tool as shown in various YouTubes. Also, why doesn't Adobe have actual online help?
Try with Toolbar > Restore Defaults > Done.
There is an online Adobe Photoshop User Guide and you can usually get quick personal answers to Photoshop issues on this friendly forum: https://helpx.adobe.com/uk/photoshop/user-guide.html
(By the way, this is a user-to-user forum.)