One page is the right length when the relevant work fits without dropping proof. It is the wrong goal when you shrink type or cut the role that matches the job.
Keep the target title, recent roles, and the two or three bullets that prove this posting. Cut older duties, software you no longer use, and a skills list that repeats the bullets.
If the matching evidence needs a second page, use two pages. A one-page file that hides the relevant job is weaker than a readable two-page file.
No. Early careers often fit on one page. Longer careers should keep the evidence the posting asks for, even if that is two pages.
Not if a person or a parser struggles to read it. Cut a weak bullet before you cut the type size.