Align Tool Greyed Out

[rich2005]

That last reply is the probable answer, in the mean time some screenshots 

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Apart from the align options, from your screenshot, no indication that you have selected a layer or layers to align.

Have a look at the Gimp documentation: https://docs.gimp.org/2.10/en/gimp-tool-align.html

A rough approximation from your screenshot:

Normally you might click in a layer to align-select, this one best 'rubber-band' a selection. If successful, there are indicators in the corners of the layer.

   

Then align whichever direction, might give this.

   

Not what you intended? There might be other easier ways.