You will almost certainly not have to re-clear security - although you can't definitively rule it out.

The vast, vast majority of pre-cleared flights will arrive into their US destination as if they were a "domestic" flight. ie, you will be let out into the departure area of the airport.

Depending on the airport layout you may need to re-clear security in order to get to your departure gate, however in Atlanta all terminals are connected air-side via the "Plane Train" so this will not be required in your case.

Technically it is possible that pre-cleared flights can be directed to arrive into the standard international arrivals area, with passengers being forced to go through US immigration/customs a second time. This is incredibly rare, so the odds of it occurring are very low - but officially it can happen.

You will almost certainly NOT have to re-clear security - although you can't definitively rule it out.

The vast, vast majority of pre-cleared flights will arrive into their US destination as if they were a "domestic" flight. ie, you will be let out into the departure area of the airport.

Depending on the airport layout you may need to re-clear security in order to get to your departure gate, however in Atlanta all terminals are connected air-side via the "Plane Train" so this will not be required in your case.

Technically it is possible that pre-cleared flights can be directed to arrive into the standard international arrivals area, with passengers being forced to go through US immigration/customs a second time. This is incredibly rare, so the odds of it occurring are very low - but officially it can happen.