LibreOffice 7.1 Help
You can undo all formatting that has not been made by styles in a few steps.
Press Ctrl+A to select the whole text.
Choose Format - Clear Direct Formatting.
While pressing the Shift key click the first and then the last sheet tab to select all sheets.
Press Ctrl+A to select the whole text.
Choose Format - Clear Direct Formatting.
Click the Outline tab to open outline view.
Press Ctrl+A to select the whole text.
Choose Format - Clear Direct Formatting.