Fitting 3D models to your footprints
Tapping on a part in the list will allow you to fit the 3D part to your footprint. Although there are conventions on how to lay out parts, it is always possible and often the case that the 3D model does not match the footprint exactly. Most of the time you only need to adjust the rotation.
Push the part with one finger around and move it so it matches the footprint. This is the same process as you do it when soldering a PCB. Using two fingers you can rotate the part. If you want to rotate the part by 90°, there are buttons for that.
Rotation angles are different for every orientation. Sometimes parts are really misaligned, just play around with the orientation and rotation buttons to get the part in the correct orientation.
If you selected the Front or Right orientation you cannot move the part to the left or right, you can just adjust the parts vertical position.
Important: Tap on the Done button to finally assign the 3D model to this part. If you choose to tap Back, you will not have assigned the part, you will just have tested it.