we are not privy to exactly how restricted and ‘encapsulated’ satan is if He appears before God to condemn the believers.
Apparently he freely comes and goes.
Job\\6 Now there was a day when the sons of God came to present themselves before the Lord, and Satan[b] also came among them. 7 The Lord said to Satan, “From where have you come?” Satan answered the Lord and said, “From going to and fro on the earth, and from walking up and down on it.”