Error trying to change column widths in TableView

I have a method that increases and decreases the width of my table at the click of a button (it works perfectly):

public void toggleTela()
{

    if(this.tblAudiencias.getWidth() == 940)
    {
        this.toogleItens(true);
        this.tblAudiencias.setMinWidth(649);
        this.tblAudiencias.setLayoutX(287);
        this.btnToggle.setText("< Ocultar");

    }
    else
    {
        this.toogleItens(false);
        this.tblAudiencias.setMinWidth(940);
        this.tblAudiencias.setLayoutX(5);
        this.btnToggle.setText("> Mostrar");
    }
    this.redefineColunas(this.tblAudiencias.getWidth());

}

The redefineColunas method should set the width of the columns according to the table:

private void redefineColunas(double tabela)
{
    this.colAudiencia.setMinWidth(tabela * 0.20);
    this.colData.setMinWidth(tabela * 0.15);
    this.colHora.setMinWidth(tabela * 0.10);
    this.colAutor.setMinWidth(tabela * 0.20);
    this.colReu.setMinWidth(tabela * 0.15);
    this.colProcesso.setMinWidth(tabela * 0.20);
}

The goal was to give percentages for each column, when it goes into else it works, it increases the table and columns, but when I click the button again to decrease the table (enter if ) the table is decreased but the columns are still large.