Modify Field Unit Settings

Hello,

we are using Graylog 6.2.2.

If I customize the field unit settings like the described in the documentation here: Widgets
this affects always all fields in this widget.
I can not set just one field let’s say to time in seconds. Always all other fields will be modified as well.
If I want to correct this in another field, it changes all other fields as well.
What am I doing wrong, or is this a bug?

Thanks in advance,

Dietmar