How Do I Do That in Photoshop?

Make Two Layers Into Just One Layer?

Go to the Layers panel and click on the first layer you want to combine, then press-and-hold the Command (PC: Ctrl) key and click on the other layer you want to combine to select them both. Now press Command-E (PC: Ctrl-E) to merge these two layers into one. By the way, this doesn’t just work with two layers, you can select as many layers as you’d like, and then use this shortcut to combine them.