Go to studio, click the account symbol and go to manage apps

Then in manage apps view click the settings and DEACTIVATE the module you want to delete (or just deactivate)

Deactivated modules can be deleted. Be aware, that all content within this module is deleted too.

Confirm and the module will be deleted (with its content).

Be aware that some modules have dependencies. The deletion dialog will give information about this.

That helped me a lot.

Thank you.