Create multiple SVG files
In order to make multiple HMI pages just create more *.hmi.svg files in the same folder as index.hmi.svg. No more settings is required.
Create link between pages
You can navigate between pages using "Link" feature. Right-click on any object (e.g. rectangle) -> Create link, right-click again -> Link Properties -> fill in the Href field with:
/hmi/<span class="hljs-emphasis">*filename*</span>.htmlThis object then becomes a hyperlink to another webpage.
Link settings - Target field
_blank - opens in new tab or window
_parent - opens in parent frame
_self - opens in current frame
_top - opens in top-most frame
frame name - opens in frame called name
For more details see: https://www.w3schools.com/tags/att_a_target.asp
Example
There is also example on Multipage HMI available - have a look at "0301-07_Multi-page_HMI" example.