Thank you @SupportiveEntity, but this is for UE4, in which everything worked anyway. Also I haven’t found any mentions about “scale” or “size” words in this tutorial. Also I couldn’t adjust the scale manually because the super-root bone (named “GameEngine” or “Uengine”) is not even selectable. When I click on it, nothing happens. Maybe the problem is actually in the UE5 and not in the “adjusting the scale”, because, as mentioned above, in the UE4 all the retargeting system worked fine? (Note: but I cannot use the UE4 since UE5 has very many other fine things, and since almost all new asset packs are not present for UE4.)