How to change the onion skin opacity?

Harmony Harmony Support and Troubleshooting
1

I’m using Harmony advanced and I’ve gone through preferences multiple times but I can’t seem to find a way to lower the opacity of the onion skin.

2

http://docs.toonboom.com/help/harmony-14/advanced/reference/dialog-box/onion-skin-light-table-transparency-dialog-box.html?Highlight=light%20table