Hello there @Extrahdmi!
Checking around the community, it is currently not possible to affect the scale of all migrated assets at the same time, they need to be adjusted individually in your project, using the scaling tools in engine.
You could setup a blueprint to adjust the scale of the meshes along a desired logic, as seen in the thread below, but you still have the problem of every asset being a different scale. Implementing an “average” scale for everything won’t resolve the inconsistencies among each piece.
A good workflow to deal with this scenario, is to set up a reference plane, and systematically scale assets one by one, choosing one of them as your main reference, then adjusting their size accordingly. There’s an example of said process in the video guide below, please check it out:
