Unable to find elements from pop-up in a native android app

Appium versión: 1.15.0 to 1.17.1-1

I have been trying to find a pop-up element, but when I use appium’s inspector to find it, the xml only show an element as the whole window, the pop-up elements are notin there. The app use the following lib to generate the pop-up: https://github.com/Cleveroad/BlurTutorial.

I also tried to get the page source with getSourcePage(), but I got the same xml than appium.

Someone know how to find this kind of elements or handle this trouble?, I just want to click on the popup to close it.

I will be grateful for your help.