Most IITs do not allow changing courses from dual degree to a B.Tech degree. However, you can shift from a B.Tech degree to a dual degree. The rules regarding the change of course in IIT Bhubaneswar are the same as other IITs.
In IIT Bhubaneswar, only those students will be eligible to be considered for branch change after the second(spring) semester, who have-
Students in the 4th year of B.Tech courses are also eligible to apply for a change of branch in any engineering (4-Year or 5-Year dual degree) course. But the selection is strictly based on merit of the applicants. Generally, applicants who rank in the top 1% are considered first. In case of ties, the deciding factor is the JEE rank of the applicants. Students who are interested in changing their courses may enlist up to 5 choices of branch according to their preference.