Hey there,
A few questions here, so I’ll answer them in order.
Changing the length of the input fields can be done by adding some custom CSS. This can be inserted into an area of your WordPress site like your theme’s stylesheet, which is accessible in your WP-admin area. Here’s the bit of code:
.mc_merge_var input {
width: 500px;
}
And change the width as you desire.
To change the spacing between the fields, it sounds like you may be looking to change the vertical spacing between each field. If this is the case, you may consider changing the height of each field’s area by adding a bit of CSS code like this:
.mc_merge_var {
height: 50px;
}
Finally, to remove the “HTML, Text, Mobile” fields from the bottom of your form, you’ll actually want to disable this option inside of your MailChimp list first. Then, sync your changes to the WordPress plugin by going to the MailChimp plugin’s settings and clicking the “update list” button.
To make these changes in your MailChimp account, you’ll need to edit your list’s settings and disable the option to allow your users to set their preferred format. This article shows how to access those options: How can I change my list name and list defaults?: https://eepurl.com/BQWyz
If you have any questions, let us know!