PyVista Plotter in QFrame doesn't fill the full frame

I want to make a GUI with QtDesigner.

There is a QFrame for the PyVista plot but the plot doesn't fill the full frame.

Here is my code:

from PySide6.QtWidgets import QApplication, QMainWindow
from QT_Designer.Validation import Ui_MainWindow
from pyvistaqt import QtInteractor, MainWindow


class Frm_main(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)

        # Window (Plotter or Frame)
        self.plotter = QtInteractor(self.f_window)  

I tried to set the plotter to full_screen or change the layout of the frame but neither fixes the issue.

I looked at a view examples and find now a solution:

from PySide6.QtWidgets import QApplication, QMainWindow, QVBoxLayout
from QT_Designer.Validation import Ui_MainWindow
from pyvistaqt import QtInteractor, MainWindow

class Frm_main(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)

        vlayout = QVBoxLayout()

        # Window (Plotter or Frame)
        self.plotter = QtInteractor(self.f_window)  
        vlayout.addWidget(self.plotter.interactor)
        self.f_window.setLayout(vlayout)

Now the plotter is in the full frame :)