How to change Tracking Type from Website to Mobile App?

I have Piwik a few years now.
At first I have only a Mobile App to track. But now i add a new Website to track and I see there is now a joice between tracking a Website or a Mobile App.
The Qustion is now, how I can switch from “Website” to “Mobile App” Type without to change the Tracking-Code and loose my data?
It seems like there is not a menu to change this when I try to edit my tracked website.

I used to use the plugin egg redirect. may be useful.
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