If you are talking about how the links show up horizontally, with those parallelogram shaped buttons, that's probably achieved by editing the HTML in the Page's Rich Content Editor (alternatively, some extensions may also provide some easier customization, as well as Canvas' own upcoming Block Editor).
Note that what HTML you can use within Canvas is limited by the HTML allowlist.
Did you take that screenshot? If so, you should be able to click the Edit button on the top right, and then click the "</>" button on the bottom left of the rich content editor to see how this was achieved: How do I use the HTML view in the Rich Content Edi... - Instructure Community - 618225