Win10 RS2 14905's Insider settings are not available.

Now Microsoft has responded to this question. In the Microsoft community, an employee named Jason said that the issue would not affect Win10 Mobile Preview 14905, only on the 14905 version on the PC side. At present, Microsoft has found and fixed the problem, and the subsequent version will return to normal, but Microsoft will not push the patch to 14905 for this issue.
Jason also asks the Insiders to rest assured that this issue will not affect other system features. According to the Win10 preview version of the push rate since Tang Najie took office, it is estimated that the new version will come in a day or two, and then users will not encounter this problem if they upgrade to the new version in time.