If the table model contains a large number of columns, the column filter popup menu will become extremely large. For this reason, TableAssistant may display an additional dialog, where users can visually select which columns to display from a scrollable list.

You control this dialog's visibility with:

public void setShowMore(boolean showMore);

public boolean getShowMore();

Also the maximum number of columns to display in the column filter popup menu is controlled with:

public void setMaxColumns(int maxColumns);

public int getMaxColumns();