As the name suggests, this element is customizable in the document. It can be used to insert text that can be modified by the document writers. It is important to note that no smart fields can be placed in the customizable text.
To add a customizable text, hover the mouse over the element where you want to add it and click 'Customizable text'.
Here you can enter the text where adjustments can be made at the document level. It is clear from the template that this text is editable by the blue border on the left of the document, a fixed text element does not have this.
This is what the document author sees when filling in the document. The text can be edited and saved. An editable text must be unchecked by the writer by clicking on the bullet on the right.