Hi Rewt and thank you a lot for your helpful answer.

As I mentioned in my previous message I finally arranged a meeting with the new prof and things became more clear. However, during our discussion I realised that my main supervisor agreed to a methodology that it was no proper. Actually, I sent him my experimental design and he said to me that I am ready to proceed. Due to COVID restrictions I couldn't proceed to it so far (thankfully, as I would have faced many problems)! However, my new committee member realised the methodological flaws and that is why he insisted in changing methodology (this became clear during our discussion). Thus, I am really dissappointed of my main supervisor as if it wasn't for my new committee member I would have proceeded to an experiment that would have been faulty (at least) making me loosing time. I have realised so far that my main sup's style is quite hands-off (so swim or sink) but I think that he should have indicated some flaws in my experimental design. And the worst (for me) is that if I ask him why he told me to proceed to the experiment he will say that I should have found the flaws on my own (maybe he would be right?). So, I am very confused regarding the sup's role in the whole phd process...

Thank you eng77 for your answer!

This is an excellent advise. I was so emotionally overwhelmed that I couldn't think logically and dispassionately. I indeed arranged a meeting with the new prof and this appeared to be extremely helpful for me. We talked for an hour and a half! Now, the methodological issues regarding my study are more clear.

No, actually I don't face issues of disrespect. Their behaviour is very nice.

Hello! I need your help as I am desperate.
That's how the story goes. I am at the beginning of my second year of my PhD. Recently, a member of my PhD committee was replaced. His place was taken by a professor who is a collaborator and personal friend of my main supervisor and who showed particular interest in my study. This at first made me extremely happy as my main supervisor does not show much interest in me and my study (e.g. the feedback I receive on my drafts is rather superficial than in depth. Many times in the past I have realized some important mistakes and omissions in my draft that my supervisor didn't). This has made me feel completely helpless and neglected. Thus, I based my hopes on the new professor. However, my initial joy turned into disappointment as I noticed that he is trying to change my existing experimental design to one that serves his own research interests. Long story short, he has almost canceled anything I have done so far but without giving me any reason for it (e.g. he says it's better to use a specific type of analysis and not the one I propose without explaining to me WHY). I am very annoyed and angry mainly because my supervisor does not take a position (although he has previously agreed on the methodology I had suggested) and has left me alone. The meetings we have (altogether) are unhelpful leaving me more confused and frustrated than before (e.g. One time I was so annoyed that after the meeting I burst into tears). I cannot even sleep at night thinking to leave my phd. Next week the three of us will meet again and I am puzzled over how to handle this. Should I clearly state that they are not supportive? I am afraid that this will make things worse...