This FAQ describes how to change the E modulus of a concrete material in the Materials library (Main menu > Libraries > Materials).
The modulus of elasticity of a concrete material is calculated automatically according to the Eurocode (EN 1992-1-1).
This value cannot be edited when the option ‘Calculated depended values’ is checked.
If the option ‘Calculated depended values’ is unchecked, the value of the E modulus can manually be edited: