QTabWidgets: I can't remove a tab

[Alberto7]

Hello,
Sorry for my English. I'm new to Qt, in my project the user can move from one tab to the next one. ( Slot of the button: ui->Pestanas->insertTab(1, ui->Pestana_Orden_Trabajo, "Orden de Trabajo");
ui->Pestanas->setCurrentIndex(1); )

It works, but I would like to just show the first tab when the window appears for the first time.
I've tried this:

Partes::Partes(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Partes)
{
    ui->setupUi(this);
 
    ui->Pestanas->setCurrentIndex(0);
    ui->Pestanas->removeTab(1);
    ui->Pestanas->removeTab(2);
 
}

Partes::Partes(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Partes)
{
    ui->setupUi(this);

    ui->Pestanas->setCurrentIndex(0);
    ui->Pestanas->removeTab(1);
    ui->Pestanas->removeTab(2);

}

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It makes disappear the second tab that comes with the QTabWidget deffault form when you first include it in the ui. But the the tab that I added for designing the widgets I want it to bring inside doesn't disappear.

Does anyone know any way to do it?

Thanks for replying!