How can I align layer using shortcut keys?

I work with multiple layers including texts. I need to know why the layer align is disable and how can I use shortcuts key to align the layer in center

I work with multiple layers including texts. I need to know why the layer align is disable and how can I use shortcuts key to align the layer in center
To align a single layer you have to give it a reference, and that is usually Select All That would allow you to centre the layer. To align layers with reference to each other, you have to select the layers concerned. The Align icons will then be available to be clicked on.
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