We study the dependence of the frequency, lifetime, and waiting time of a dynamic domain structure of the "leading center"(CC) type on the bias field in films of garnet-ferrites with perpendicular anisotropy. A change in the nature of the destruction of the leading center with a change in the displacement field was found. Earlier in [1-11], it was reported on the discovery of dynamic domain structures (DDS), which were called "leading centers"and on some features of the behavior of such DDS. Due to the low natural frequency fs of the EC operation in [2, 3], from visual observations with a microscope, it was possible to obtain quantitative data on the dependence of fs on the amplitude of the external alternating field