Photoshop: where are my "apply change" icons?

I’ve tried to find this in troubleshooting guides but not knowing the correct terms I can’t find it.

I’m trying to layer some images in PhotoShop. Usually it works perfectly. For some reason today when I add another image or crop or apply any changes it doesn’t give me the green check mark/red “No” sign symbol that allows you to apply a change or select a layer, which means you can’t progress beyond that move.

Does anybody know if I have somehow accidentally turned the apply change icons off or if there’s a way I can turn them back on or… what exactly?

Thanks for any help

Window > Options

You could also hit “enter” to confirm changes, and “esc” to reject.