You can use Remesh to retopologize your draft models. To do this, select a draft model in your generation history on left sidebar, then click Remesh on the right sidebar, and adjust your configurations by switching Topology to Quad, and confirm. After the Remesh process is done, you can then select the remeshed model for downloading.

For users who still use the legacy Image to 3D workspace, it's essential to choose the topology before generating your 3D model, and if you have already opted for Quad topology, ensure that you disable Mesh Optimization at download stage to successfully download the quad mesh.