No box mode selectable for input number helper created in UI


I just wanted to create an input number helper with box mode via the web interface. Unfortunately, the form does not show me any advanced configurations (see screenshot attached). I am running HA Core 2023.11.3, Frontend 20231030.2 in a Docker container. I also checked against another HA instance, not running in Docker, and there other configuration options like box mode are visible inside the form.

Can anybody help me explaining, why I can just only very basic configurations via the web interface?

Via YAML, I am able to adjust the mentioned advanced configurations.