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по своему усмотрению ("In most situations *at* is the most common usage. But *in* is also correct and seems to be in wide use. So I'd say they are interchangeable, with the first being the obviously preferred choice and the second less so, but still grammatical." See examples of both: "The company has the right, at its sole discretion, to ... • will be determined by the Company in its sole discretion."  stackexchange.com ART Vancouver) | |||
| по своему единоличному усмотрению (Евгений Тамарченко) | |||
| in its sole discretion: 3 phrases in 2 subjects |
| General | 1 |
| Law | 2 |