While editing a pdf in LibreOffice Draw, there is a checkbox, how do I “check” it?
PDFs open in Draw because they are considered graphic documents. Consequently, they lose their form properties and behaviour.
Add any graphic symbol (for instance U+2713 CHECK MARK) anywhere in the document and move it above the check box. There also exists a Unicode character for a checked box U+2611 BALLOT BOX WITH CHECK.
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