Can I change the text box width in an input table ?

Yes, you can change the width of textbox in an Input Table by injecting CSS codes. To learn more about customizing form using CSS codes, please refer to this guide: Customize Your Form Using Custom CSS Codes.

To adjust the width of the textbox in the Input table by adding CSS codes, you need first to look for their field ID's and add the width you preferred. 

For example:

#input_3_0_0{

width: 100px;

}

Here's the guide on How to Find Field IDs and Names.

Here's the guide also on How to Inject Custom CSS Codes.

Let us know if you need further assistance.