Congratulations!
iWoc Trio controllers (see below) are standard on flat-bar Orbeas, but not on the dropbar road bikes.
There are two things you could consider that may help:
1. Connect to the bike with an app and Bluetooth to tune the power levels, amongst other things. This isn't of use during the ride, it just sets the max levels, etc.
2. Add an iWoc Trio handlebar controller if you want something slightly more 'standard' looking. You'll need to visit an Orbea dealer to fit the Trio, and an unreasonably large chunk of cash - about £85 + labour if I remember correctly.
iWoc Trio controllers are standard on flat-bar Orbeas, but not on the dropbar road bikes.
I suggest you just try with the single iWoc button first for a few weeks - it is very easy to use after a few rides.
The iWoc Trio looks like this (trio for 3 buttons: up, down, on-off):