Leandro - thanks for you question. I am going to move it to a more appropriate product community where it will receive greater visibility. The Member Resources community is for general community questions/suggestions. However, I can't tell from your question whether you are using our PADS or Xpedition product. For now, I will move it to the PADS community. If you are using Xpedition, let me know and I will move to that community. Thanks.
Not a good idea to flood under the part, use next layer below the device ( 2, 3, etc.)
I agree, in this design I actually created mixed planes in internal and bottom layers layers.
I am using PADS