I can't expose a variant (eye icon is not toggilng) on Graph Editor

Hi, I am following the Introduction to Common UI tutorial (around 1:08:00). When we are setting up the generic button, my Common Ui text variable can’t be exposed on the Graph Editor. There is a tooltip message saying the variable is public and can’t be editible, but I am following the exact same steps of the tutorial, but this issue does not happen there. Thanks!