How to set a shortcut for expanding and collapsing sidebar

[sourovch]

hi I used firefox with an extension for that enables sidebar. I used to collapse and expend my sidebar using f1 key so it has became a habit. recently I moved to zen I couldn't find any options to change expend/collapse shortcut option. can any one let me know is there a way to do it?

[fviz]

Do you mean this? It's the very last option, was set by default to Alt + P on Windows.