I'd also want to know how to deal with the worry about someone stealing it while you're in a store or restaurant. I was nervous enough about my regular bike, but an expensive e-bike worries me too much.
Outside a store or restaurant during business hours, however, is a much more risky proposition for a thief from all the foot traffic. They’d rather pursue low hanging fruit like apartment parking garages where their efforts will probably guarantee them a half dozen bikes in one go.
You should also always insure your bike. My renters insurance covers mine for theft with zero deductible.
Park it near other bikes. Lock it up properly with a good U-Lock (yes, these can be defeated but thieves are more likely to be opportunistic drug addicts than dorky guys with YouTube channels). Add a chain lock around the other tire if you’re super nervous. Don’t leave your bike outside overnight (locked up or not). Bring your bike into your home/apartment - even if your building has a bike room or bike parking area. Add your bike to your renter/homeowners insurance - this is not expensive and adds some peace of mind.
Yes, your bike might get stolen, but a lot of things might happen.
Video on the same topic: There's a proven way to stop bike theft. So why are so few cities doing it?
There’s a proven way to avoid putting innocent people to death by lethal injection (death penalty). There’s a proven way to eliminate the terror of medical bankruptcy. Why aren’t these things being done in America?
Edit: URL (sheesh) https://www.youtube.com/watch?v=RZkJP9D6fms
Ulock or chain the rest.