There are some great videos out there on using large floor jacks to lift the legs of above ground pools when they are full of water, but here’s a method of using the basic scissor jack that comes standard in almost all cars to do the same.
This demonstration was done using the popular Intex 18 ft. above ground pool but would likely work for other pool models as well. BTW this was filmed during COVID-19 self-isolation of 2020, so I consider myself fortunate to have been able to snag one of these great pools before the supply dried up.
Note: Be careful when you have your leg jacked up not to put your hand, fingers, toes, or anything you value under the leg. If there is a slippage or breakage of equipment that leg is going to come down with a massive amount of force. Do this at your own risk and please, be careful!