Missing "Use up to X processes in parallel" setting

I have filed a new issue: https://youtrack.jetbrains.com/issue/RIDER-14544 but I thought I'd also ask here.

TL;DR: I am unable to locate this setting in Preferences > Build, Execution, Deployment > Toolset and Build as described on https://www.jetbrains.com/help/rider/Settings_Toolset_and_Build.html.