Hy guys, probably my question will be very stupid but....
i can't find the solution...

i'd like change dimension about images in article gallery... (llok at image uploaded)

now they are 200 px but i'd like to have smaller and have images on three column.. i found where set image for articles, categories, but not the gallery!

can u help me please?

If you are using SIG then the dimension for the gallery's thumbnails are in the plugin settings. If it is SIG Pro then in the component settings.
If you are using any other gallery mechanism you should search in its settings.