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Hello. I use K2 News Category with Catnews sub-template.

How to change this small picture when I open this image?

You can't. It gets its dimensions from the image itself. If you have set the Large image to be 200px width then that is what you will get in the popup.

But can I change it somewhere? Anywhere.

Mayby in some settings, mayby in some css file?

The fact that you are getting a popup of the image in the category listing is not a default K2 functionality but it is rather one of your template. You can check your K2 template overrides (templates/your_template/html/com_k2) and edit the category_item.php file. Locate the image block and change the url to fetch the XL image, for example in order for it to be bigger.

I would recommend you advised your template developer/provider in order to assist you with this.

But when You go toone of the article and click the image, size of it is OK. It's big.

portal1.hostingspace.pl/aktualnosci/item/118-badzmy-ostrozni-slizgie-ulice

That is because in the item view you are getting the XL sized image in the popup. You just have to do the same for the listing item.

I don't know what to do.

I'm a new user of Joomla and K2.

Can You help me with that?

I could walk you through this but this has to do with a customisation your template uses.
I think that it would be best if you advised your template developer/provider to help you with that change.

I did that, but I wait over week and still don't get any answer from him.

The best I can do is to give you a hint on where to look. You should have a module in your homepage that is loading the news section. You need to locate that module and look in its code this

<a data-lightbox="on" href="...."> Zoom </a>

You need to find a way to change the href option to a different sized image result.