Select the text passage in one of the table cells whose formatting you need to copy with the mouse;
Click the "Format Painter" icon on the toolbar;
Select the text passage in one of the table cells you want to apply the same formatting to;
In the case when the copied style needs to be applied to several table cells, please use the Ctrl key for multiselect.
To quickly remove the formatting that you have applied to a text passage:
Select the text passage which formatting you want to remove;
Click the "Clear formatting" icon on the toolbar.