Thank you so much for the guidance. Sir Umar Makhzumi, yes sir I have shear wall system may be thats why ETABs is not giving an option for sway preferences before the analysis. But after design when I right click any element then in overwrite option there is sway and it is as sway special, and if I change it to sway intermediate then most of the elements pass.
Another problem is that I am having a very high deflection for my structure, it is about 20 inches at top story, can you please suggest what changes should I make to reduce the deflection. The area of my structure is 100x100 sq feet, zone 2B, 21 story, soil type SD and I want to do static analysis.