I am glad to see that you have resolved the issue by yourself.
Further, talking about our default loading animation, I assume you mean the one that comes from Kendo UI Mobile. Please, correct me if I am wrong.
If my above assumption is right, you should be able to change it with some CSS. Just overwrite the styles of the following elements:
<div class="km-loader km-widget">
<span class="km-loading km-spin"></span>
I hope this helps.
Share what you think about AppBuilder and Telerik Platform with us in our feedback portal, so we can become even better!