UE4/ WorldMachine - How to smooth an entire landscape in UE?

Hi, i´m woring with UE4.24 and worldmachine, but once i sent the zip file with height to UE and créate a landscape, there is a lot of spikes, and… smothing by hand, each Little spike is time waisting,

How may i smooth an entire landscape in UE4, to certain percentage, to not lose all details, but avoid spikes or Sharp corners?

Please help!