Planar decal showing on multiple faces


I’ve started using decals (handy!), but I’ve noticed that planar decals seem to be projecting on multiple faces like so:

This is what things look like with the decal widget enabled:

What option do I appear to be missing so that it only projects on the front surface?

Here are the underlying test files:
Multi faced decal.3dm (727.8 KB)

Thanks for any help in advance!

this is one object has two faces facing the same side so Decals will be projected on both faces , this is how decals work as far as i know ,

you need to separate the part .


Thanks for the info, @JP-Mike.

Was hoping there was an option I was missing, but it is what it is.

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Thanks for the feature request, I filed this as

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