Regarding the selection method of the reverse side

[m.ishihara]

Hello, I am a newbie who recently started using Sketchup.
I am Japanese, so sorry if my English is wrong.

For example, The backs of the faces in the imported dxf or 3DS file may be mixed up.

Is there a way to select only the reverse side at once in Sketchup?

Best regards.

[francisquitof]

Select any face well oriented, right click on it and select orient faces.

[m.ishihara]

I was able to resolve the issue.
Thanks for your help.

many many thanks.