How can I reduce the column width of an Input Table?

How can I reduce the column width of an Input Table Property when I have selected Numeric Text Box (under Input Type) in the fields property?
I am able to reduce the width when I select Text Box.

You may inject some CSS code to handle the input width, first you will need to get the <li> element id in order to affect that specific field:

Once you have the id replace it on the bold id below:

#id_102 .form-matrix-table .form-textbox {
    width: 32px !important;
}

You may change the "32px" value according to the size you need to have on the fields.

This guide will help you injecting the code to your form: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

I hope this helps.