As per Section 3.8 Table 3, the slenderness ratio (KL/r) of compression members shall not exceed 180, and the slenderness ratio (L/r) of tension members shall not exceed 400.
You can edit the default values through MAIN and TMAIN parameters, as defined in D8.A.4 Design Parameters.
The slenderness check is not used as a critical member ratio check. If a slenderness check is included and exceeds unity (1.0), then it may be reported as the governing criteria. However, if it is less than unity, it will be reported but will not be used as the governing ratio.