Is there any way to freeze a header at the top of a UI? I was hoping that a!headerContentLayout would support this functionality, but as far as I can tell it does not
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What do you mean by "freeze"? Same header four several forms?
By freeze, I mean that the header would remain visible as the user scrolls down the UI, similar to the functionality of freezing a row in excel.
That is not possible.
You can try to wrap your body content into a card layout with a fixed height. A longer body will then scroll inside that card layout. You might want to toy around with padding and margins.