Make billing and shipping info shorter for less space

2)In the part where you fill in the billing and shipping info can I bring
together less space between the lines so the form will be shorter ?

I can see that you were using conditions for your addresses, is this what you're trying to achieve in the first place? Anyway, if you still want to reduce the spacing of each field in the address field, that's possible when you inject the following CSS codes to your form. This will reduce the margin spacing between the address elements (see image below for the sample result).

[data-type="control_address"] .form-sub-label {

  margin-top: 0;

}

[data-type="control_address"] .form-address-line-wrapper{

  margin-top:4px;

}

Guide: How to Inject Custom CSS Codes

Expected result: