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Hi @testtttt1
This could be a change, to not show a tab if there is only 1.
I can see from code that the tab title is hidden via CSS
<coral-tablist hidden="hidden" ...
Example of hidden attribute and if I disable CSS for hidden attribute then I can see the tab.

If you have specific use case to show a single tab as well, then you can override this CSS and show the tab
Example:
form.cq-dialog coral-tabview > coral-tablist[hidden]{
display:flex !important;
}
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