You can get a drill bit out of DeWalt 20v Max in this way.
First, you use the counterclockwise locking drill head with the wrench to loosen the drill head.
Next, once the drill head is loosened, keep rotating the drill with your hand counterclockwise, until the drill head is the right size for the drill bit, let’s stop.
And then, you put the drill bit in the center of the machine.
Finally, use a spanner and turn clockwise to fix the drill.
You need to use a wrench, not to use your hands because using your bare hands will not be tight enough and cause unsafe for long-term usage.