How do I change from mono mode to stereo in L316 Maximizer installed in Logic Pro?
As with all Waves plugins, there is both Mono and Stereo versions of the L316. This is denoted by the (m) or (s) at the end of the plugin name. Unfortunately changing versions this way will remove any settings you may have. I have found, though, that you can copy and paste settings between versions.
It’s a little cumbersome, but I believe the reason for doing this is to maintain backwards compatibility with projects over the last 20 to 30 years.