The Normal.tmvx document template is the default template for new documents. If you choose the command File | New, this template will always be set. It contains no text and only the default "Normal" character and paragraph styles as well as some styles for headings.
Accordingly, the Normal.tmvx template is a suitable basis for creating a completely new document template from scratch.
Important: You should not usually change the Normal.tmvx default template. If you want to do this anyway, you should be aware that Normal.tmvx contains the default values for page, paragraph and character formatting as well as many other default values. A change affects all documents which are then created based on the Normal.tmvx default template.
If, for example, you want to change the default font for all documents that will be created in future based on the Normal.tmvx template, open this template, change the character formatting of the "Normal" paragraph style, and save the template.
You can also choose a different default template for new files:
To do so, choose the ribbon command File | New 
(click directly on the icon itself), select the desired template in the dialog box and click on Set as default. From now on, TextMaker will always offer this template as the default template when you create a new document.