Hiding Phases and underlay PDF

Hi,
I am a new user and new to the forum, apologies if this question has already been answered. I have 2 PDF files, one with existing site conditions and one with proposed. After creating the strip and fill removal, and overlaying the 2 PDF files, I find I am unable to read the levels on my proposed phase that I want to work on. Is there a way to just see the 1 phase that I wish to work on and hide any PDF and/or Phase that I wish to? I have attached the file I have been working on, you can see I can no longer vie and identify the proposed levels and surfaces. Thanks for your help.