You can't change the grouping labels in QuickBooks.
The Net Other Income label mirrors the Net Ordinary Income and Net Income labels. In all cases, if the number is negative, you lost money and if positive, you gained money for that category.
For example, in each of the two sub-totals and the total for the P&L below, there is a loss, labeled "...Income", but since the amount is negative, a loss is understood. Generally "Net Income" is understood to be less than 0.00 if the number is negative.