The display of the course page layout appears broken (i.e. topics displaying behind each other so they are not visible, blocks appearing under topics even though there is space on the right sidebar, and/or the window is larger than a mobile or table display).
Broken page layouts are almost always caused by content with malformed formatting/HTML being pasted into the editor. To prevent this issue, it is best to always paste content in as plain text and do any formatting (i.e. headings, bold/italic, lists, tables) with the AsULearn text editor.
To paste content as plain text, use the keyboard combination CTRL (CMMD for Mac) + SHIFT + V (instead of the standard CTRL (CMMD for Mac) + V).
To fix a broken page layout, edit the last content that was changed (just before the page appeared to 'break'), copy the content (either in the content or description field), and paste it back in as plain text. If you're unsure which content was last edited, the offending content is usually about where the layout breaks on the page. If you are unable to access it because of the broken layout, use the Activities block to access lists of course activities where they can be viewed/edited directly. You can also try to change the course format to see if that helps determine where the malformed HTML is and allows access to edit it.