We are aware of an issue reported by some Nektar/Logic Pro users where some of Logic’s customizable settings become disabled or can’t be accessed, even though Advanced functions are enabled.
We have unfortunately not been able to reproduce the issue on any of our test systems. Logic Pro is highly customizable so it is possible the issue relates to a very specific user configuration. If you are experiencing this issue, please do not hesitate to get in touch with our support. We appreciate any information, that may help us reproduce, and ultimately resolve, the problem.
In the meantime if you experience this issue, custom settings can be restored as follows:
–  From Logic Pro’s menu locate “Settings/Advanced”
–  In the “Advanced” menu, untick “Enable Complete Features” and tick it again. The Advanced menu features will now reappear.