# "Features": named groups of settings

All delta options can go under the `[delta]` section in your git config file. However, you can also use named "features" to keep things organized: these are sections in git config like `[delta "my-feature"]`. Here's an example using two custom features:

    [delta]
        features = unobtrusive-line-numbers decorations
        whitespace-error-style = 22 reverse

    [delta "unobtrusive-line-numbers"]
        line-numbers = true
        line-numbers-minus-style = "#444444"
        line-numbers-zero-style = "#444444"
        line-numbers-plus-style = "#444444"
        line-numbers-left-format = "{nm:>4}┊"
        line-numbers-right-format = "{np:>4}│"
        line-numbers-left-style = blue
        line-numbers-right-style = blue

    [delta "decorations"]
        commit-decoration-style = bold yellow box ul
        file-style = bold yellow ul
        file-decoration-style = none
        hunk-header-decoration-style = yellow box

The environment variable `DELTA_FEATURES` can used to enable features from the command line: it should be set to a space-separated string of feature names. If you precede this with a `+` symbol, then the features are added to those configured elsewhere, instead of replacing them. This is very useful, for example to temporarily switch delta to side-by-side mode you can do

    export DELTA_FEATURES=+side-by-side

and to undo that:

    export DELTA_FEATURES=+