Hi Pilou - the filter is a state that you can set on a scene browser item. Once it is set it will limit selection so that only objects that match that item will be selected.

So for example - set a filter on Style = Red. now when you click in the viewport or do any other selection method it will only select things that have style = red.

You'll be able to use this in combination with other selection methods - for example set a filter on Style = Red and then go to the Types section and select curves - only red curves will get selected due to the filter being active.

- Michael