Select the text you want to change.
To change all of the text in a text box or a table cell, select the text box or triple-click the table cell.
Click the Text tab at the top of the sidebar on the right, then click the Style button near the top of the sidebar.
If you don’t see a sidebar, or the sidebar doesn’t have a Text tab, click
in the toolbar.
In the Font section, click
, then select or deselect the Strikethrough checkbox.

Tip: You can set keyboard shortcuts to quickly apply a strikethrough or other character styles to text.