You can also use left right keys to navigate. Just doesn't work with scroll wheel, if that is what you were expecting.
It's software for people giving talks, not for you. the fact that people can see it online is just a bonus.
It's not for you. You are not the primary audience. The user of the software is the person giving the talk. The fact that the slides are online is just a bonus.
The user of the software is the person giving the talk.