When using range filter it would be very useful to have a histogram on top (see screen paint attached).
Then you know automatically if you are removing core data or outliers in your data or if there are multiple parts in the data.
If you would like to have this histogram you could add a new filter type Range Filter with Histogram (very easy to find and understand for users) or have it as a property in Filtering Scheme Properties (quite hidden features then).
You see this histogram in data preparation tools a lot, also it is shown in Data Panel for a column below the the basic statistics (by the way you should add histogram for in database connections).