Answer
(Fatwa: 2105/3720=B/1429)
It is not mentioned in the Hadith to stand keeping feet together, but only to keep ankles together is mentioned which is interpreted by the scholars of Hadith that both the ankles should be opposite to each other. Therefore, there is no wrong to keep distance of four fingers or less or more in between the feet. Undoubtedly, it is possible to act upon the Hadith. You can experience it by standing with others if you are unable to understand.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband