How to select all layers in a non-US keyboard

I have a Spanish keyboard and I don’t know how to select all layers (I’ve tried to simulate Shift-Accent but I’ve failed).
Is there a quick way to switch from one layer to all and again to one in these keyboards?

do you have a back-tick key? [backwards single quote]

weird, there isn’t an option for it in the menus

No, I haven’t. This is something people needs all the time, so surely some people in Spain knows the answer?

but you probably know that already.


In the forum I have received the answer: you must use the key ñ (n tilde).