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Through manual overwrite by checking radio button of User Specified, users are welcome to comply with the previous 7.5√f 'c value, or apply another value based on engineering judgment or project requirements. This is done by selecting Define > Materials... > Modify/Show Material... as shown in Figure 1:
For British, Hong Kong, Indian and British Singapore Standards, program default modulus of rupture for cracked deflection is limited to 1 MPa or 0.55 MPa in short term and in long term deflection calculations, respectively. Those limits can be overwritten based on your engineering judgment by entering any other value under User Specified.