Unable to delete a template app

Pratip_Aditya 

Template apps are different from normal Power BI Apps. Semantic models you have added into the app should have M query parameters. Download your report and open in power bi desktop and in power query editor create the parameters and publish your model again and then you will be able to configure those parameters in template app.

Please go through this doc and follow the steps to complete the app creation process: https://learn.microsoft.com/en-us/power-bi/connect-data/service-template-apps-create

Since you have not created the app, If you do not want a template workspace then delete the workspace after taking a backup of your content. 
You cannot conver an app workspace into a normal workspace.

If you would have published your app to Testing or pre-porduction then you can follow these steps for deleting them: https://learn.microsoft.com/en-us/power-bi/connect-data/service-template-update-delete-extract#delete-template-app-version

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