As title says
from documentation
It's only available in folders where it can be turned on (which can also depend on configuration).
Can't see what kind of folder you're in though as the screenshot is cropped of context.
''Manual sorting is currently not supported in Flat View or when the file display is grouped.''
https://www.gpsoft.com.au/help/opus12/index.html#!Documents/Manual_Sorting1.htm
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Thats it, turned grouping off and it appears! many thanks.
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I'm going to use that the next time I get a helpfully cropped screenshot missing useful stuff.