You are using the latests version of the Cineware plugin that does not access to old renderer versions. The only way to go bak is tou use After Effects CC 2019. The new cineware plugin version is updated to reflect the latests innovations and changes of the R23 viewport..
The latest version of cineware plugin can read old cinema 4D projects but you have no access to the new Viewport settings for these projects. If you want to use AE 2020 you must use Cinema 4D R23 for full access of the new viewport features.