This is a very straightforward function that allows you to see at a glance which columns have filters applied, together with an option to clear them.
You can either use the Column Filter popup or the Column Filter Function Toolbar. if using the toolbar, you can click the 'Clear button to remove the currently applied filters.
Column Filters cannot be saved for re-use (though any column filters active when the application closes will be re-applied on restart.
If you want to re-use Column Filters then click the Save button to convert them into, named, User Filters.
You can convert a Column Filter into a User Filter