User Configuration > Administrative Templates > Microsoft Project 2016 > Project Options > Calculation > Calculation options for 'Project1'
User
HKCU\software\policies\microsoft\office\16.0\ms project\options\calculation
Specifies that Project should calculate and display a critical path for each independent network of tasks within the project. If you enable this setting, Project will calculate multiple critical paths. If you disable or do not configure this setting, the user's default setting is used.