# Customizing Settings
With the [CLI](../../reference/cli.ipynb), if you create an `{lite-dir}/overrides.json`
in either the root, or a specific `{lite-dir}/{app}/` directory, these will be merged
into `{output-dir}/{app?/}jupyter-lite.json#/jupyter-config-data/settingsOverrides`.
## Examples
### Customize the `REPL` app
Let's say you would like to customize the behavior of the `REPL` app, and use the
terminal interaction mode.
You can create the following `overrides.json` in `{lite-dir}/repl/` before building:
```json
{
"@jupyterlab/console-extension:tracker": {
"interactionMode": "terminal"
}
}
```
One of the effects of using `terminal` for the `interactionMode` will be the switch from
Shift-Enter to Enter for executing code.
### Add a download button in the notebook menu bar
If you want to add a download button in the notebook menu bar, you can add the following
lines in `overrides.json`:
```json
{
"@jupyterlab/notebook-extension:panel": {
"toolbar": [
{
"name": "download",
"label": "Download",
"args": {},
"command": "docmanager:download",
"icon": "ui-components:download",
"rank": 50
}
]
}
}
```
You will now have a menu bar similar to the one below:
