We are so glad to hear you were able to install and deploy your application! Please feel free to reach out to our support team (firstname.lastname@example.org) during your trial, as the trial gives full access to our professional support team.
Our enterprise advocates are also happy to help walk through some of these questions during your trial as well, so please feel free to reach out as you have questions!
In any case, R processes on RStudio Connect are not limited to a single user. Rather, Shiny sessions can be shared within a single R session (by default, a single R session is configured on Connect to peak at ~ 20 users). The actual configuration that is ideal for your application will vary, but you should generally not expect to need 1 R process per user (that would require up to 100 R processes!).
In any case, the limit of 20 is an arbitrary limit that we put into the product, but is configurable in the
/etc/rstudio-connect/rstudio-connect.gcfg file. More on that topic here: https://docs.rstudio.com/connect/admin/appendix/configuration/#Scheduler.MaxProcessesLimit
If you're looking at scaling and configuring applications, some other resources that might be useful:
I hope that helps! Please let us know if you have any follow-up questions!