A recruiter screening call is a positive sign, but it is not an offer signal on its own. You should treat it as an early evaluation step that can still matter quite a bit.
The call is often used to confirm basic fit, interest, timing, communication quality, and whether your background makes sense for the role or office. It may feel lighter than an interview, but you should still prepare clear answers on your story and motivation.
The best mindset is to take it seriously without overdramatizing it. You are not being asked to case, but you are being assessed.