The maximum number of Odoo connections is set through the workers parameter in the Odoo server configuration file. This parameter specifies the number of worker processes started by the Odoo server, each of which can handle a certain number of connections. Therefore, the workers parameter can be set to the desired maximum number of connections divided by the number of connections each process can handle, in order to determine the maximum number of worker processes. It should be noted that increasing the number of worker processes may increase system resource usage, particularly memory and CPU usage, so adjustments should be made based on actual system performance. It is recommended to back up the Odoo server configuration file before making modifications, and to monitor and test system performance changes.