Is it normal to see .idea, .metadata, .recommenders, *.iml in the Project sidebar?
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In a project I just imported into IntelliJ IDEA, I see .idea, .metadata, .recommenders, *.iml in the Project sidebar. Is that normal? I doubt it as those are meta-information and seems should be invisible.

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Yes, it has been always like that.
If you want you can hide them via the preferences -> editor -> file types
at the bottom of this window there is a section "ignore files and folders".
Simply add a couple like the example below to hide those.