How to show cards side by side

hi all
i have a problem with the cards in my frontend.
the first picture show one of my tabs - the cards are side by side:

but look at my media tab, all the cards are one on top of each other.
the group config is the same, the resolution is the same… so why is like that?
thank you

This is one off the greatest mysterys in HA. :thinking:
I think! :slightly_smiling_face:

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