I have 11sp Ultegra in a full synchro shift mode on my Bianchi. Shimano has two buttons on each lever, similar to mechanical shifters, so the right lever buttons control the rear derailleur, and the left buttons control the front. As many people on the internet mentioned, the button that shifts down is kinda small and sometimes hard to find with gloves on. Since mine in synchro shift mode, I reprogrammed the buttons to work in the way shifting works on Sram electronic shifters, e.g. any button on the left lever shifts to an easier gear and the right one shifts to a harder gear. Ultegra shifters also have two additional buttons on top of the hoods that I programmed to control the front derailleur, but in practice, I never use them other than for maintenance.
Electronic shifting is amazing.