Hi,
The Insert-Function Dialog does not list the built-in functions min and max if the customFunctions plugin is active. In that case only Min and Max are listed. However, both versions are available via dynamic assistant.
Perhaps the dialog lacks case sensitivity at some point?
Best regards, Martin Kraska

Martin Kraska
Pre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx