Hello Guys!
I have a problem here that I don't know how to solve, and if someone could help me, would be really appreciated!
THE PROBLEM: I want to exhibit the following gallery on my App:

where each row of the Gallery has a Black Rectangle covering the whole row.
So, when I run the App on a Mobile, the screen exhibits the Gallery as follows:

which is the expected, since I'm using the current screen configuration:

BUT, when I rotate the mobile's screen 90º, the following happens:

where a white gap appears between each Row.
QUESTION: What I want is to exhibit each row next to each other, without this Gap. Could anybody help me?
Thanks! And any help would be appreciated!