How to reduce the gap after the prefix and get all fields on the same line?

There's a really large gap between the "Prefix" and "First Name" portions of this form. I've been trying to reduce the gap and get all three boxes (Prefix, First Name, Last Name) on the same line, but to no avail.

Is there anyway that this can be rectified? Thanks in advance!

I've cloned your form(FormID:92492086444463) and tested on my cloned form.

When I cloned your form, the prefix part on your screenshot is missing. I added prefix as a dropdown menu.

Prefix field added form:

Please follow the instructions below:

1. Add the prefix from Full Name properties with click on Options then enable the prefix.

2. Select Dropdown option.

3. Click on Advanced Designer button on Form Designer.

4. Please inject the following CSS code to CSS Editor.

.form-line.jf-required {

    display : table !important;

    width : 100% !important;

}

.form-line.jf-required #cid_53 span.form-sub-label-container:first-child {

    width : 16% !important;

}

.form-line.jf-required #cid_53 span.form-sub-label-container:last-child {

    padding-right : 0 !important;

}

#cid_53 span.form-sub-label-container {

    display : table-cell !important;

    width : 42% !important;

    padding-right : 2%;

}

.dropdown-match-height.form-dropdown {

    height : 24px;

}

5. Please make sure you saved the changes.

6. You can check the field in preview mode.

Also, you can check the guide below:

https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

I hope this will help.

If you need any further assistance, please let us know.