SOLVED! OK so how does one set the anchor for scaling a layer??

Here's another tip--if you hold the Alt key on Windows or the Option key on macOS when you scale, then the scaling will be from the center of the image.

Quizá lo encuentres aquí

https://helpx.adobe.com/es/search.html?q=punto+ancla+escalado+capas&start_index=0&country=ES&activeScopes=%5B%22helpx%3Ahelp%22%5D&scopeConfigs=%5B%7B%22value%22%3A%22helpx%3Ahelp%22%2C%22renderStyle%22%3A%22vert%22%2C%22seeMoreLink%22%3Anull%2C%22isSelectable%22%3Atrue%7D%2C%7B%22value%22%3A%22helpx%3Acommunities%22%2C%22renderStyle%22%3A%22vert%22%2C%22seeMoreLink%22%3Anull%2C%22isSelectable%22%3Atrue%7D%2C%7B%22value%22%3A%22helpx%3Alearn%22%2C%22renderStyle%22%3A%22horiz%22%2C%22seeMoreLink%22%3Anull%2C%22isSelectable%22%3Atrue%7D%2C%7B%22value%22%3A%22adobe_com%3Aproduct%22%2C%22renderStyle%22%3A%22vert%22%2C%22seeMoreLink%22%3Anull%2C%22isSelectable%22%3Atrue%7D%5D&filters=%7B%22products%22%3A%5B%22Adobe+Photoshop%22%5D%7D&banners=%7B%22aboveResults%22%3A%7B%22count%22%3A1%2C%22ids%22%3A%5B%22auto%22%5D%7D%2C%22sidebar%22%3A%7B%22count%22%3A0%2C%22ids%22%3A%5B%5D%7D%7D&ctrls=%7B%22prodFilts%22%3Atrue%7D