How to Disable Template Categories page?

How to Disable Template Categories page?

In the initial phase of implementation, I do not want to implement templates for service request generation.

Whenever a user clicks on 'Submit your Request', a default page should appear for him/her to enter the Subject and the description of the problem. Attachments can be sent.

I deleted all the configured templates and only a default template is present, which is created by system. 

When a user clicks on 'Submit your Request' button, a blank Template Categories page appears. From there, there is no way to take it forward.

How do I disable this template categories page?

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