On the library. The library is a Safari web browser window. [Backspace] in Safari is "Back" so it goes back to no page at all. To get the library back use [Command]+[right arrow] to go "Forward" tot he library. We've tried to make Safari just not do that but, no. Windows machines use a Chrome browser window and it obeys the "Don't navigate away from this page" settings.

For the screen recording, that's for the color picker. For the color picker to work it has to access the screen. I don't know why it keeps asking. Once set your Mac is supposed to remember the setting.

I've also found out that the button from the graph window in P13 at the bottom left corner is also working in P11 :-D. There is only no button to be seen... Makes things way easier.

Figured out this button on the bottom left in the mean time as well. Though the method using the context menu is really a way for me doing this, able to do this almost blindly. 

I assigned a short key or shortcut to this function whitch i can learn to use instead. Maybe worthwhile to do to taking this step upgrading to P13; At least Superfly Render engine now is compatible to my RTX GPU.

Thanks for the effort, maybe over time it will be corrected anyway by the Poser developers. Perhaps my short key is even a quicker/better solution in my case. :-)