Problem with resolution / too big images

Hello guys,

I installed kodi v17 beta 6 yesterday.
Everything is working nicely, so I am very satisfied, thank you a lot.

I tested the Estuary Skin a time ago (and there are plenty of screenshot around in the web)
so i know, that the images should fit on the screen, like here for instance (first google image result):

But in my case, it looks like this:

All in all, it looks very “over-zoomed” – the menu items on the left, the category-selection on the top and the movie images, especially the cut on the images on the right screen border.
The look in thshows and music is exactly the same.
Even if the images are bigger in my case, it doesnt look very nice because it doesnt fit the screen.

I doubt it is a resolution problem or else, because the “Settings” view is displayed normally and all elements fit the screen:

I tried googlin around to find somewhat setting or else where I could redefine the size and padding of the images (or at least the number of images displayed) but I could not find any.

May you please provide help on how I could fix this and bring back some “fullscreen”-view?
I did not attach any logs, but if you find the useful please say so, then I will provide them.

thanks in advance

best regards