LibreOffice 7.3 Help
Selects the entire content of the current file, frame, or text object.
To select all of the cells on a sheet, click the button at the intersection of the column and row header in the top left corner of the sheet.
Choose Edit - Select All.
To select all of the sheets in a spreadsheet file, right-click the name tab of a sheet, and then choose Select All Sheets.
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