Fields should always have a 100% width setting width in 240px or whatever is not very responsive and also is a huge anti pattern. Mobile first...
Also the div soup around the label and the input is totally crap and needs to go...

+1

Does this issue needs to be addressed @dgrammatiko and @infograf768

The "Title" input should be longer which it used to be in an earlier state of J4

Why the distinction? For what is worth all inputs should have a width 100% and the container div will act as the upper hard limit...

@dgrammatiko I believe it was requested by some users as it was a more meaningful field.

@C-Lodder does this issue needs to be taken forward ?

Not sure really. Im just basing this on J3 and an earlier state of J4.

@coolcat-creations will be able to give her feedback

@C-Lodder how do I contact @coolcat-creations regarding this?

She'll get a notification with the above tags

I agree to @dgrammatiko - about the length. Thanks for following up. Can anyone take care of this issue?

Yes I'm in @coolcat-creations . Please specify what exactly are the changes to be made

There are 2 places to look at:
For the extra div
/layouts/joomla/edit/title_alias.php

I just modified it here to

<?php
/**
 * @package     Joomla.Site
 * @subpackage  Layout
 *
 * @copyright   Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('JPATH_BASE') or die;

$form  = $displayData->getForm();

$title = $form->getField('title') ? 'title' : ($form->getField('name') ? 'name' : '');

echo $title ? $form->renderField($title) : '';
echo $form->renderField('alias');

for the css:
changes to be done in /administrator/templates/atum/scss/blocks/_form.scss

.form-control {
  max-width: $input-max-width;
  background-color: var(--white-offset);
}

This css override default bootstrap 100% for this class.
Not sure if we should delete the max-width or set it to 100% or none.
All depends on what we do finally about bootstrap...

@coolcat-creations
What do you think?

On changing the max-width: $input-max-width; the width of both title filed and alias field change simultaneously.

Reminder at @coolcat-creations for above Comment by @infograf768

Please see this screen: https://coolcat-creations.com/joomla/#/screens/267320995
But take Dimitris suggestion into account that both fields have 50% in Desktop and 100% width in Mobile.