The first time you opened the FormMule configuration, you had to specify how many templates you wanted...
...and the(se) template(s) were automatically christened like "Template 1" (and higher)
This template is stored in an hidden sheettab with exactly that name:

...when you press the hamburgermenu on the sheettab row you'll see it in the list...
If I click on the sheettab with the name 'Template 1' a sheet like this appears:

Now, if you find your Template ID enter this name in the menu you are stuck under 'Template'
The screenshot you showed contained a blank where I expected 'Template 1' or something like that.
So manually enter your Template ID (e.g. 'Template 1') and then proceed to get something like this.
Does this get you back in control of what you want to do?
Regards, Bart