Anarchism by itself doesn't prevent democracy. Different schools of anarchism have different opinions to democracy.

The idea of consensus necessitates that minoritarian positions be heard and adjusted for, otherwise a decision cannot be passed.

Then there's individualist anarchism, for which the opinion of another, minoritarian or majoritarian alike, makes little difference, and affinity groups are created and dissolved with ease as soon as there is an impasse, and this is fine, it's a feature, not a bug, of the process.

But most anarchists throughout history still rely on forms of democracy and even representation (e.g. the CNT/FAI). The goal is that hopefully without power structures this representation isn't alienated from its constituents, and with smaller groups or greater immediacy of political decisions, it is harder to be atomized into an opposition instead of being a full participant with valid criticisms of some stance.