The user will take a huge breath, mixing them with chakra before exhaling them into a mini chakra in the form of a sword. The chakra blade will expand upon traveling further, however, at the cost of its strength. The larger it is, the lower the capability of destruction.
Most of the people try to use it as a mid-range offensive technique to keep the radius and damage balance. Even though it is more powerful by unleashing nearer but the risk of backfiring is too high. So, people tend not to use it as melee technique unless they are cornered.