The ⨂ button in the filter field is there to make it easy to clear the contents of the field.
However, the transition effect that makes the filter field wider when the user clicks in it interferes with this. Clicking on the ⨂ doesn't clear the field; it makes the field transition into "wide mode", which moves the ⨂ away from under the cursor. So, the user has to re-position the cursor and try again.
The simplest solution might be to get rid of the transition effect. An alternative would be to make the transition happen on mouse-over, rather than on mouse-click.
The ⨂ button in the filter field is there to make it easy to clear the contents of the field.
However, the transition effect that makes the filter field wider when the user clicks in it interferes with this. Clicking on the ⨂ doesn't clear the field; it makes the field transition into "wide mode", which moves the ⨂ away from under the cursor. So, the user has to re-position the cursor and try again.
The simplest solution might be to get rid of the transition effect. An alternative would be to make the transition happen on mouse-over, rather than on mouse-click.