I'm not the best person to answer your question but since no one else is, I'll try.
It seems that you need to make the
dt element smaller. I would create a new class (fixedTiny) in
extra.less and then modify
custom_fields_macros to call it.
HTML:
.pairs.pairs--columns.pairs--fixedTiny
{
> dt
{
width: 100px;
}
}
HTML:
arg-valueClass="pairs pairs--columns pairs--fixedTiny"