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In the data group Ignore contribution of...
Disable gypsum contribution for seismic design:
If this setting is selected, gypsum wallboard will not be considered as contributing to the shear strength of any shear walls designed to resist seismic loads.
You would activate this setting if you are doing both wind and seismic design and wish to have the extra shear strength that non-wood-panels provide for wind design, but do not want the penalty of the increased seismic loading due to smaller response modification factor R that is used when non-wood-panel materials are part of the the seismic resistance system.
This setting is also useful to disable gypsum wallboard contribution if including it would cause the building to exceed the limits set in CSA O86 Table 11.8.8.
Disable gypsum contribution for wind design
If this setting is selected, gypsum wallboard is not considered as contributing to the shear strength of shear walls designed to resist wind loads, or to the calculation of deflection of those segments. This setting was introduced when CSA O86 Table 11.8.8 containing limits on gypsum wall board applied to both wind and seismic design; it now applies only to seismic design is no longer any advantage to ignoring the contribution to shear resistance of gypsum wallboard for wind design.