5G NR Dynamic Beam

Can any one clear my doubt. In 5G NR there is static (Cell level) and dynamic (user level) beam. As of now 5G NR have 8 beams,if theses 8 beams are always ON and consider wide beam to cover the whole planned sector area, then what about user level bean which is very narrow and where it exit or at which time it will transmit.
2ndly for example in below snap 2 antenna element is forming single beam , does its mean that there is 16 antenna element that can form 8 beams.

i will appreciate if some one clear my doubt;
The UE will access and registered with network through Cell Level (static beam) and then with the help of SRS the beam will be modified to become narrower, my question is from where that user level beam will be transmit .