Can a Vienna rectifier or an active front end rectifier regulate the voltage down?
A Vienna rectifier is pretty much exclusively used for making power-factor corrected (PFC) three-phase DC supplies. The working principle (as with any single-phase PFC) is that boost control is used to produce a DC voltage that is (usually) significantly higher than the peak AC voltage. Only in this way can proper PFC be achieved.

This rectifier circuit does not provide the possibility of lowering
the voltage below the level obtained from 6 diodes?

No it doesn't because to adequately perform power factor correction, the rectified bus DC voltage has the be higher than the peak AC voltage. Then a step-down DC-to-DC converter takes the bus voltage to a lower usable level.

The active front-end rectifier in your 2nd circuit is also a boost circuit and can deliver a power factor corrected DC bus voltage but, again, it will be higher than the peak AC voltage.