Rise Button to Add Content Missing

I am an active Articulate 360 user but I have not used Rise and am taking a class where I need to use it.   I started building a course but the button to add content is missing. I can add lessons but then I cannot add content to any lesson but the first one I created.  I am on a Mac using Chrome. I tried accessing through Chrome in parallels and directly outside of parallels both using Chrome.

I am attaching a screenshot.
And here is the direct link: https://rise.articulate.com/author/1zx3Cn_LzxiFXTVSIQF7Ot3aiEzd1g05#/author/course

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