With the post title block, you can display and edit the title text.
Block category: Theme.
Added in: WordPress 5.8
Sidebar settings
- Colors: Text, background and link
- Typography: Font family, font size, appearance, line height, letter case, letter spacing.
- Link settings. With the link settings, you can make the title a link, add a rel, and choose whether to open the link in a new window:

Toolbar settings
Select between heading levels H1-H6. The default heading level is two.
Left, right and center align, full-width and wide width.
HTML Markup
<!-- wp:post-title /-->
<!-- wp:post-title {"isLink":true} /-->
Output
<h2>Hello world!</h2>
Tips for using the post title block
When you use the title inside a query loop, remember to enable the link option. Otherwise, visitors can not navigate to the single post.