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To modify the way IntelliJ deals with auto imports you need
to open the Settings dialog (๐๐๐ฟ๐น+๐๐น๐+๐ฆ)
and navigate to the ๐๐ฑ๐ถ๐๐ผ๐ฟ | ๐๐ผ๐ฑ๐ฒ ๐ฆ๐๐๐น๐ฒ | ๐๐ฎ๐๐ฎ | ๐๐บ๐ฝ๐ผ๐ฟ๐๐ ๐๐ฎ๐ฏ.
In this dialog, you need to check the Use single class import option.
You'll also need to change the default limit for
๐๐น๐ฎ๐๐ ๐ฐ๐ผ๐๐ป๐ ๐๐ผ ๐๐๐ฒ ๐ถ๐บ๐ฝ๐ผ๐ฟ๐ ๐๐ถ๐๐ต '*'
and
๐ก๐ฎ๐บ๐ฒ๐ ๐ฐ๐ผ๐๐ป๐ ๐๐ผ ๐๐๐ฒ ๐๐๐ฎ๐๐ถ๐ฐ ๐ถ๐บ๐ฝ๐ผ๐ฟ๐ ๐๐ถ๐๐ต '*'
from 5 to a big enough threshold such as 999.