Grap Explorer is a testing tool that should only be used for testing purposes, for example you can log into the tool to call the graph API endpoint.
Do not use the Grap Explorer app in your production, because it is essentially a multi-tenant application. When you log into the Grap Explorer app, it will join your organization as an enterprise app, but you can't manage the app.
You should create your own app in Microsoft Entra ID, which is more secure and easier to manage.
Hope this helps.
If the reply is helpful, please click Accept Answer and kindly upvote it. If you have additional questions about this answer, please click Comment.