Turn down the squared tabs on the brushbar so that they face outward.

Use a screwdriver to pry the belt up from the brushbar.

Be careful not to cut the belt with the screwdriver.

While holding the belt, pull the brushbar to the left and remove it from the vacuum.

You can let go of the belt when it's free from the brushbar. The belt will not retract into the vacuum.

During reassembly, insert the brushbar with the tabs facing outward, then rotate the tabs up to lock the brushbar in place.