different from Fluent，material in the Mfix has only one properties window but the species is not.
so,which materials the properties belong to ?
The screenshot you posted shows the settings for the fluid (or gas) phase (viscosity, density, etc). If you click on the ‘H20_L’ in the Species table, you will get a popup with the properties of each species.
There are also tabs for setting the properties of each solid phase. Please refer to MFiX documentation at MFiX User Manual — MFiX 22.1 documentation