Kindly refer to the following link(s):

https://islamqa.info/en/26182

My question is that if someone is praying and he doesn’t have anything kept in front of him then from how far can we pass in front of him and if someone tries to pass in front of us while praying can we stop him with our hand ?

Prayer | June 23, 2017 1:29 am
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If I forget the third rakat while praying by myself at home, do I need to sit for tashahud when making up the single, forgotten rakat?
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If a person misses sunnah 2 rakats of fajr, does he has to wait for sun to rise to offer them or can he pray right after the farz nimaz