What does the blue box on this file mean?
Answered

Tooltip might be helpful here. Tried looking up in the docs, but didn't find a great answer.
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Hi!
Files marked with blue overlay badges are source files (for CMake projects, if a file icon does not have this overlay badge, it means that the file is not included in CMakeLists.txt).
The information is here - https://www.jetbrains.com/help/clion/icons-and-symbols.html#prj-view-icons.