I'm starting to get a little bit of a handle on layouts, because I didn't initially create one. I have three layouts: header_layout (there's a button for the tools menu, a header, and a button for user login). Next comes my problematic tasks_layout layout. It should have a static 'Tasks' label at the top center, and under it a button (+) that adds a task (the same one is in the tools menu). If tasks are added, they should be vertical, each 50 pixels below the previous one, and there should be a (+) button at the very bottom after the last task.

I use spacing and stretch to customize the interface, but when I add a checkbox with a task, all elements from the layout disappear and the checkbox appears at the very beginning of the layout. The buttons don't appear on the checkbox at all. I need each subsequent checkbox to appear as I described above, and if there are too many tasks, I want to add a scrollbar. Also, when I click add second task, the program crashes. When I add a task, for some reason the window expands a bit to the side.

At the very bottom I have a third layout that has a statusbar made with Qlabel.

    def clear_layout(self, layout):
        while layout.count():
            item = layout.takeAt(0)
            if item.widget():
                item.widget().deleteLater()
            elif item.layout():
                self.clear_layout(item.layout())

    def show_all_task_checkboxes(self):
        self.clear_layout(self.tasks_layout)

        # title layout
        title_tasks_layout = QHBoxLayout()
        title_tasks_layout.addStretch()
        title_tasks_layout.addWidget(self.title_tasks_label, alignment=Qt.AlignCenter)
        title_tasks_layout.addStretch()
        self.tasks_layout.addLayout(title_tasks_layout)

        for checkbox, data in self.checkbox_dict.items():
            checkbox_layout = QHBoxLayout()
            checkbox_layout.addWidget(checkbox)
            checkbox.show()

            for button in data["buttons"]:
                checkbox_layout.addWidget(button)
                button.show()

            self.tasks_layout.addLayout(checkbox_layout)

        # (+) button layout
        plus_button_layout = QHBoxLayout()
        plus_button_layout.addSpacing(75)
        self.add_task_plus_button.setFixedSize(50,50)
        plus_button_layout.addWidget(self.add_task_plus_button, alignment=Qt.AlignLeft)
        plus_button_layout.addStretch()
        self.tasks_layout.addLayout(plus_button_layout)

        self.set_statusbar_over_all_widgets()

The code that is associated with the tasks layout above. Code with all other layouts below (you may need this too)

 self.central_widget = QWidget(self)
 self.main_layout = QVBoxLayout()

 self.header_layout = QHBoxLayout()
 self.tasks_layout = QVBoxLayout()
 self.statusbar_layout = QHBoxLayout()

self.setCentralWidget(self.central_widget)

        self.central_widget.setLayout(self.main_layout)
        self.main_layout.setAlignment(Qt.AlignTop)

        self.main_layout.setContentsMargins(0, 0, 0, 0)
        self.main_layout.setSpacing(0)

        self.main_layout.addLayout(self.header_layout,1)
        self.main_layout.addLayout(self.tasks_layout,4)
        self.main_layout.addLayout(self.statusbar_layout,1)


        # add to header layout
        self.header_layout.addWidget(self.tool_button)
        self.header_layout.addWidget(self.title_label)
        self.header_layout.addWidget(self.user_login_button)

        self.tool_button.setFixedSize(100,100)
        self.title_label.setFixedHeight(100)
        self.user_login_button.setFixedSize(100,100)

        self.tool_button.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        self.user_login_button.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        self.title_label.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)

        # add to tasks layout widgets and show
        self.tasks_layout.setAlignment(Qt.AlignTop)

        self.title_tasks_label.setFixedHeight(75)
        # self.add_task_plus_button.setFixedSize(100,100)

        self.show_all_task_checkboxes()

        # add to statusbar layout
        self.statusbar_layout.addWidget(self.status_label)
        self.status_label.setFixedHeight(25)

I'd really appreciate it if you could help me out. Thank you.

I tried to find a solution using AI, but it didn't work for me. I couldn't find any good videos on this topic that would help me much