@cissurf you can create a chat for any group. You can create a group specific form category through privileges, but this is not done automatically.
perfect image for groups
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@hollosch rather than dimension, I believe image/writing itself is more important. You can move/adjust the picture after you upload it; however how it looks on the desktop will be different from how it looks on mobile.
Here are the examples from our site:
on mobile:
on desktop:
I guess you can see the difference...