Is it a big deal if I have overlapping uvs?

is it a big deal if I have overlapping uvs? will it affect my functionality of games or other functionality after packing game ?

Overlapping UVs affects two things. How the material is displayed on the object, and how the lightmap is displayed on the object ( because UE makes it’s lightmaps from the UVs by default )

So, if you can’t see anything wrong with the material or lightmap, don’t worry.