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Increasing the "Maximum number of threads" from 100 to 4096 in "Tools -> Preferences..." will cause the Threads column to shrink. In this case the column is too small to show all 4 digits.
Which column do you mean?
I can see 4096 without any problems.
The column in the middle of the bottom with the number 1486 on my screenshot. Just set the "Maximum number of threads" to 4096, close the application and open it again. Now you have to scan a big enough range for 1000 threads or more to show up.