try to insert a column in LibreOffice writer did not fine it under format or insert this is version 6.0.1. let me know what to do.
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If I understand your question, Format-Columns should create columns, and Insert-ManualBreak-ColumnBreak should move the cursor into the next column.
Format-Columns is missing from LibreOffice Writer 6. I’m also here to find out how to do this is version 6.
Edit: I now know, it’s moved to Insert-Section-Column.