controller.kv

#:kivy 1.0

<Controller>:
    label_wid: my_custom_label

    BoxLayout:
        orientation: 'vertical'

        TextInput:
            id: my_custom_label
            font_size: '50sp'
            size_hint_y: 0.8
            readonly: True
            padding:40
            text: 'TWEETS WILL BE DISPLAYED HERE, ENJOY!'

        BoxLayout:
            size_hint_y: 0.2
            orientation: 'horizontal'
            Button:
                id: btn_start
                text: 'Start'
                on_press: root.do_action()
            BoxLayout:
                orientation: 'vertical'
                Label:
                    text: 'Project Name'
                TextInput:
                    id: project_input
                    size_hint_y: None
                    height: '32dp'
                    text: ''
                    focus: True
                Label:
                    text: 'Search Terms (comma separated)'
                TextInput:
                    id: search_terms
                    size_hint_y: None
                    height: '32dp'
                    text: ''
                Label:
                    text: 'Output URL'
                TextInput:
                    id: project_output
                    size_hint_y: None
                    height: '32dp'
                    text: ''
                    readonly: True