How to set a key for Eagle Vision?

[krmtdfr9]

I am trying to use Eagle Vision to read a Cave Painting. However I cannot find any place where I can set a key to use. Reading the E-Manual under Swimming Controls the default is listed as the "?" with a box around it. clicking on the "?" however does nothing. Is there any way to set a button for Eagle Vision? PS I tried the "V" it also does not work.

[AC Denton]

You hold down for eagle vision.
Also use a controller.

[HiTmAn]

eagle vision is v if i rember dont change controls u wil be lost cz many keys have multiple functions