To surface only the abbreviations of Order Flow Events (e.g. - Buy Programs Waning = BPW) right-click on your NinjaTrader chart and select "Indicators".

In the Indicators window, highlight the appropriate indicator (for example " ...sceeto 2.0 | S&P 500 | Order Flow Monitor"), and from the Parameters list on the right, choose  "1. Show Short Names".

 

By default, this parameter is set to "False". Set this parameter to "True", click "Apply" and the indicator will switch to abbreviations.