How can you change certain connections in the rail planner app?

So, I want to travel from Bremen (GER) to Liverpool (UK) with a train, I bought a Pass and activated it with the app. Now I am looking for a good connection. 

I started to looking for it with google maps and found the route Bremen - Cologne - Bruxelles - London - Liverpool. It is starting at a good time and I don’t need switch as often as I would with other connections.

Then I found the exact same route in the app, starting at the same time and taking the same first two trains from Bremen to Cologne and from Cologne to Bruxelles. But the next train from Bruxelles to London is for some reason two hours later then what google maps suggested to me. Even the website of Eurostar, which is the train from Bruxelles to London, says that there is a train 15.56 and at 17.56 but the app only shows the second train for which I would need to wait two and a half hours.

So, my question is, is there any way to change only some trains or like only certain parts of your connection within the app because I don’t want to have such a long transfer time and in the end I don’t want to arrive at 22:30, like the Planner app tells me?