Review the default ajax wait default positioning
Frontend (App Interfaces)
OutSystems 8.0
It's overlapping with Chrome's URL highlighter on the bottom left corner
And if you have a very long page with a search form on top, you won't see the spinner while you're waiting for the search results
2016-11-21 23-23-05
Gonçalo Borrêga
The new Theme now has it on the bottom right.
It is also customizable via CSS so you can place it where it works better with your applications or style it to better match your own design.
With some help from other people, I positioned the ajax wait spinner in the middle of the of the screen. When you scroll or resize the screen it stays in the middle of the display. The folowing CSS is placed in your application, page, or webblock CSS file. It only modifies the position. I tested on PC not mobile. Please post if you can add to this CSS.
div.Feedback_AjaxWait {
  top: 50%;
  left: 40%;
  max-width: 100px;