Want to align 2 half fields in the same row

To change the style of your CF7 forms you would need to edit the CSS style sheets used by your WordPress theme.

See Styling Contact Form for a general explanation of styling CF7 forms using CSS.

There is a link at the bottom of the page to a comprehensive and detailed article on Styling Contact Form 7 Forms.

To align the name and email fields in the same row, I use Ordered List elements to display multiple fields on single line.

HTML:

<ol class="singleline">
<li> <label for="cf7-phone">Phone</label> [text cf7-phone 15/]</li>
<li> <label for="cf7-mobile">Mobile</label> [text cf7-mobile 15/]</li>
</ol>

Added to Form section of CF7 interface. Labels are added for improved accessability.

CSS:

.wpcf7-form .singleline ol {
list-style: none;
margin: 0;
}

.wpcf7-form .singleline li{
display: inline-block;
float: left;
margin-right: 10px;
padding-right: 10px;
}

Add via Child Theme or use custom CSS plugin.

You could consider using Contact Form 7 Skins to style your Contact Form 7 Forms.

You can now use the add-on CF7 Skins Ready to put form Name and email fields together on the same line