Welcome to the forums @LucasBaun
You can edit an embedded document in a new tab by double-clicking on it on the canvas, or its thumbnail in the Layers Panel, with the Move Tool.
Alternatively, you can ALT-click any layer’s thumbnail in the Layers Panel to enter Isolation Mode where you only see the layer you ALT-clicked on (and its child layers).
However, I don’t think it’s possible to view ‘any-old-layer’ in its own tab, just certain cases work that way (as far as I know).
