Hi Steeve,
Just get it working !
filter Name : clear
label : Effacer les filtres
Empty text : Effacer
Filter type : resetall
You need to set at least on default values for the others elements ==> the resetall button set to default values filters
The default values depend with the types :
-- for textbox, default value as to be '_empty' or 'whateveryouwantstring'
-- for combobox, default value as to be 'all' to clear all categories for exemple, or another value of your choice
It deserve to be in the doc !