app.py

import dash
from dash import Dash, dcc, html

app = Dash(__name__, use_pages=True)

app.layout = html.Div(
    [
        html.Nav(
            html.Div(
                html.Ul(
                    [
                        html.Li(
                            dcc.Link(
                                f"{page['name']}",
                                href=page["relative_path"],
                                className="nav-link active",
                            ),
                            className="nav-item-dropdown",
                        )
                        for page in dash.page_registry.values()
                    ],
                    className="navbar-nav me-auto mb-2 mb-lg-0",
                ),
                className="container-fluid",
            ),
            className="navbar navbar-expand-lg bg-light",
        ),
        dash.page_container,
    ]
)


if __name__ == "__main__":
    app.run_server(debug=True)