When working in modern word processors with multiple documents or sources it’s easy to end up with all sorts of different formats mixed together. The task of trying to manually format all the text in a document can be tedious and allows room for error. A simple solution is the Format Painter, which will copy the format of selected text to other areas of the document. Both LibreOffice and MS Office have this feature represented by a paintbrush icon in the tool bar.
To use the format painter highlight text with the format you want to paint other text with, then if only painting one selection of text click the format painter button or double click the format painter if painting multiple selections. The button will remain pressed and you can then highlight the text to be painted which will then have same format as the original selection.