'Select' object is not callable

I apologize for the confusion. The `ui.select` function in `nicegui` creates a `Select` object, not a callable function. To set the length of a `Select` object in `nicegui`, you can use the `style` attribute of the `Select` object to set the desired width.

Here's an example:

from nicegui import ui

def main_page():
    options = ['Option 1', 'Option 2', 'Option 3']
    select = ui.select(options)
    select.style.width = '200px'  # Set the width of the Select object

main_page()
ui.app()

In this example, we create a `Select` object with three options. We then set the width of the `Select` object using the `style.width` attribute. You can adjust the value `'200px'` to your desired length.

Please note that this solution assumes you are using the `nicegui` library for creating graphical user interfaces in Python. If you are using a different library or framework, the approach may vary.