When a regular filter is properly defined (see 
Filters) it can be saved as a User defined filter (UDF) using the icon with three dots.
The list of existing UDF's is available by clicking on the filter icon in the left panel.
 
 
|  Create a UDFChoose this button to create a User defined filter. | 
|  | 
|  List of exisiting UDFsView a list of existing User Defined Filters. | 
|  |