Hola, siempre auq abro documento en Adobe, los mismo me aparecen en negativo, es decir a blanco y negro, como desactivo eso, yo quiero ver en el formato original
As mentioned above, the file appears in negative, black, and white.
If you are referring to the fact that the file opens with a black background and white text, it is because you have enabled the Night mode.
If it looks like this black:
Then disable the Night Mode and see if that works.
Hope you are doing well. Sorry for your experience with Acrobat Reader Mobile.
Adding to what @AkanchhaS mentioned, if you are opening a PDF that contains images, you will see them in negative when viewing in night mode.
Let us know if you are able to view the PDF properly after disabling night mode.