Eurostar say leisure travel is back to 100% of pre-pandemic levels & business travel 80-85%. But due to Brexit they can only provide 70% of pre-pandemic capacity. They've plans to resolve this including trialling online check-in, I've added a summary at https://www.seat61.com/news.htm
The Man in Seat 61:  What's new on the site

News page on the Man in Seat 61 website

@seatsixtyone "trailling online check-in"? How are Eurostar so far behind the airlines? I really want to use them, but the incredible check-in times make it really hard after spending hours just to get to St Pancras in the first place.
@Ravenfeeder @seatsixtyone I'm still trying to figure out what online check-in would provide... Isn't the current check-in procedure just scanning your ticket into a machine so that it opens the gate? 🤔
@slasherfun I don't know, it's been nearly 8 years since I last used it, but I seem to recall having to go to the counter to check-in. I'm hoping to use it more in the next few years so I'd like things to be as easy as possible. When flying I can check-in either from my hotel or the transport to the airport and then just scan in using my phone.