You can set it in the Solids pane:
This will be applied to all ICs and BCs, unless you overwrite it when you set the ICs and BCs:
You can load some ready-to-run PIC setups to get more familiar with the settings from the New Project (in Main menu):
This will be applied to all ICs and BCs, unless you overwrite it when you set the ICs and BCs:
