These settings control how Compiler Explorer acts for you. They are not preserved as part of shared URLs, and are persisted locally using browser local storage.
To add a library, search for one you want and select the version in the dropdown. Or if you have favorited it before, just click the library name in the Favorites section. Libraries are installed |using the conan.io package manager, except for Microsoft compilers, where vcpkg is used.
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Compiler overrides
To override a compiler's defaults, you can change the following options. Note that this might lead to errors and unsupported situations. These also only apply to compilation, not for executing your code.
Compiler environment variables
One environment variable per line, KEY=VALUE, that will be set during compilation.
Favorites
Runtime tools
To apply runtime tooling or settings when executing your code.