Congrats on getting your Haibike! Maybe you could get more speed with a higher psi tire inflation on a smoother road, but 25 sure beats pure pedal power.
Here's a thread of a similar conversation from a while back. Maybe it will be helpful:
https://electricbikereview.com/forums/threads/2015-dash-rear-wheel-doesnt-spin-freely.1626/
Glad you're liking your ebike! Sorry about your display though; that's annoying. Maybe contact the dealer you got it from.
Here is Stromer's page for help and information on the display interface: https://www.stromerbike.com/en_INT/customer-service/st1/interface-basic-settings.html
Hey everyone, we made it so you can add a location if they go to their account settings. Click your name at the top right of this page, and you should land here: