Should I print files in single-side or double-sided?

[xuhao]

I plan to file green application this month. For I-130, I-485, I-864, should I print them in single-sided or double-sided?
Which way is USCIS prefer, or it doesn't matter.
Someone told me to print single-sided. But I didn't find this requirement in USCIS official website.

[Tylveng]

I do not know what USCIS prefers but in a consultation with a lawyer that I had prior to filing, one of the things she mentioned was submitting latest up-to-date forms from the website in a single sided fashion.

[rayb]

Submitting paperwork printed on both sides creates extra work and consternation for reviewers, especially if they need to scan any of your documents.

--Ray B

I plan to file green application this month. For I-130, I-485, I-864, should I print them in single-sided or double-sided?
Which way is USCIS prefer, or it doesn't matter.
Someone told me to print single-sided. But I didn't find this requirement in USCIS official website.