fun-adventure.py

from nicegui import ui

class my_widget:
    def __init__(self, name, value):
        self.name = name
        self.value = value
        self.container = ui.row()
        
        self.create_widget()

    def create_widget(self):
        with self.container:
            ui.input(label=self.name, placeholder='fichier de propriétés', value=self.value).props('dense').classes('w-[51.667px]') # avoid relative width
            ui.switch(text='var', value=True).props('dense')
            ui.button('Edit')

with ui.row(): # no need gap-0 since the root cause is solved
    my_widget('wid1', 'toto')
    my_widget('wid2', 'tata')

ui.run()