To add a more tag, click on the Add Block button and select the More block. Alternatively, you can start typing
/more in a new paragraph block, then press enter.
When you insert this block, a link will be placed directly after your excerpt, pointing the reader to the full post. You can put this link anywhere in a post, and customize it to say whatever you want.
Every block has its own block-specific controls that allow you to manipulate the block directly in the editor. The more block is pretty straightforward so it only has the more options control.
You can edit the Read More text that appears by clicking in the middle of the dashed lines, feel free to delete the default text and type anything you want.
This option is disabled by default, and it’s recommended to leave it off if you would like to display the content that appears before the more block on the full post once the user clicks on the Read More button.
By enabling the hide teaser option, the content that appears before more block will not display on the full post once the user clicks on the Read More button.
Clicking on the cog icon next to the publish button will toggle the visibility of this panel. While most blocks have specific options in the editor sidebar in addition to the options found in the block toolbar, the more tag block does not have extra options.
The advanced tab lets you add a CSS class to your block, allowing you to write custom CSS and apply styles to the block as you see fit.