Setting up my Polk Audio 265LS speakers

I will glad if someone can help me.

I have the following setup:
Receiver: Yamaha rx-679 + ypao
Front: Polk 265LS pair
Center: POLK cs...
Rear: Polk RC65i
Sub: Polk PSW110

I have several questions regarding my Polk audio 265 LS in-wall speakers.

I already read your user manual of 265 LS.

1. when do I need to put inside the Port Plug?

2. When should I need to press the button of the Tweeter Switch?

3. When should I need to press the button of the Tweeter Switch?

4. When setting up my system (Yamaha rx-679 + ypao), I have noticed that the Yamaha receiver has recognized my pair 265LS as a "small speakers". Which means, it won't send them lower frequency sounds. The Yamaha auto setup has set the crossover value to 100Hz.

It looks to me strange, I was expected that 265LS will be recognized as "large speakers". and low frequency will be sent to them.