I have never seen an e-bike with anything but a front wheel that just spun around, other than when you engage a hand brake or stick out your foot to stop it, both of which are NOT recommended.
There are a lot of companies selling e-bikes via mail. You pick one out from some slick photos and videos, and it arrives in the mail when you are expected to assemble it.
I strongly suggest to anyone that before they buy an e-bike that they try several models. A lot of bike stores now rent out e-bikes, so renting one for a few hours is fairly easy. And even if a bike dealer does not rent them out, they will seldom object to your taking a few minutes ride on several models. Should also try more than one brand.
Also, as was pointed out, e-bikes are very heavy, making them a bit unmanageable at first, especially when you add a motor that can seem to take off suddenly. I gave my older e-bike to my DIL and have let my teenaged grandchildren ride my old or new one. However, I tell them to ride it without the motor on until they get comfortable, and then turn on the pedal boost or try the accelerator, but to keep it very slow at first.
Also, I used to let a lot of people try my old bike, but stopped that when one lady came back from a very short ride with a broken wrist!! She lost control on a slippery patch and fell really hard. (Because of the weight, it is a lot harder to recover from a bad move than it is on a regular bike.) So no more tryouts for strangers!!!