> For the complete documentation index, see [llms.txt](https://docs.notionapps.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.notionapps.com/settings/advanced.md).

# Settings → Advanced

Canonical page for dangerous or rare app switches: delete, custom JS gate, and other advanced flags.

## What this is / when to use it

Advanced is the pane you open on purpose. Most makers never need it after the first publish.

## Before you start

You understand delete is irreversible for the NotionApps app (Notion data stays).

## Build it

1. Open **Settings → Advanced**.
2. Use **Custom JavaScript** only if the plan allows it and you have read the how-to.
3. **Delete app** — type the name, confirm. See [Start from a template](https://docs.notionapps.com/get-started/start-from-a-template#delete-an-app).
4. Leave feature flags you do not recognize alone.

## Every control

| Control            | What it does                                                                               |
| ------------------ | ------------------------------------------------------------------------------------------ |
| Custom JS          | Plan-gated. How-to stays the job page.                                                     |
| Delete app         | Removes the app, URL, and builder history.                                                 |
| Experimental flags | Internal or entitlement-gated. If a flag is undocumented, do not treat a stub as coverage. |

## What users see

Nothing unless you ship custom JS that changes the chrome.

## Limits and plans

Custom JS and some flags are entitlement-gated.

## Example

Delete a failed clone after you confirm the source app is intact.

## Fix problems

Deleted the wrong app: restore from a clone if you have one. Notion rows are still in Notion.

## Related

[Plans](https://docs.notionapps.com/plans-and-entitlements). [Hire an expert](https://docs.notionapps.com/hire-an-expert) if you need JS you do not want to own.