I’m using Okular v26.03.80 with a pdf file (saved as a pdf, not an Okular archive).
Steps to recreate problem:
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Click the popup note annotation button on the toolbar to enable popup note.
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Create a popup note.
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The popup note text area is not resizable (in older versions of Okular this was resizable)
3b) Same problem with you have LaTeX code in the popup annotation: note text areas is not resizable before or after TeX rendering.