Fuel Tank Size - 23 gallons?

Hi All!
Trying to confirm the fuel tank size for the 3.5L PowerBoost Hybrid.
Looking at dealer inventory and pulling up their window stickers, all it says is "standard fuel tank".
From the order guide, it looks like the 36 gal tank is "deleted" when selecting the PowerBoost hybrid option.

Does that mean 23 gallons, and is there an option available to increase that to 36?

Thanks a lot!