While I still think in-person retrospectives are more effective, remote is the new normal and it’s absolutely possible to facilitate great ones:
If you use Miro, our Mega Template might be interesting for you:
There is also a series of interviews with people who have facilitated distributed retrospectives for a while. They talk planning, challenges and tools – bear in mind, these interviews are from 2016, so well before Covid. Tools have gotten a lot better since then: