Quick Filter Demo
The quick filter is the bar underneath the Column Header. If its set to visible in the underlying grid (for ag-Grid: gridOptions.floatingfilter) it will work in the Adaptable Blotter.
The quick filter allows you quick access to Column Filters so you can type in 15 in the quick filter and that will be come a column filter of range x=15.
The same wildcards (and more) that are available in Quick Search can be used here (e.g > 15, 's*', '1:10' [between 1 and 10])