Never mind, I just discovered there's an update: 6.1.5.6 | Titanium Track
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Thanks Slug, Meanwhile I found out that on a Oneplus One you need to longpress the hardware menu button (nowhere else that you can do that). The first app I have tried where this was neccessary, but as said this is probably one of the most non-standard android app's out there and could need a SERIOUS overhaul IMHO.Welcome to AF!
The "Settings" option is named Preferences, and is found under the Menu top-right of the app's title bar.