I do not fully understand you. In the B4J IDE 64 bit version 6.80, the B4xTable uses an internal library version 1.22. As soon as you have entered a character in the search bar, an X will appear.
Update:
Or do you mean that if the search box no longer has the focus, you first have to select the search box to make the X button visible again. Therefore you want when you hover the mouse pointer over the search box, the search box is automatically selected?