I have heard that, junior monks(< 5 vassas) are not encouraged(/allowed) to teach Dhamma in retreat settings to lay followers, rather monk need to stay with preceptor all the time, is it true?
Can junior monk teach Dhamma(in retreat settings) in front of senior monk?
Thanks
This is purely a convention practiced in some communities. There is nothing in the Vinaya about this.
In fact, if a monk sees his preceptor doing something wrong that might endanger his monk life, then the student has an obligation to preach Dhamma to his preceptor.
Moreover, “retreat setting” is a modern thing. So we don’t find that in the Vinaya.
The convention is that before speaking, the junior monk would be introduced or invited by the senior monk or would at least say a few words at the beginning of their talk to acknowledge the senior monk(s). But this is just a matter of politeness.