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Can't access classes in the selector

I’m new to the Forum and definitely just a beginner with Webflow so I apologize in advance. I can’t access my classes in the Selector although they show up in the Style Manager. I have been sporadically learning Webflow, and I am pretty sure they used to be available in a drop down. I guess I am missing a step. As an example: I created a new page and added an H1 Heading to a Section. I clicked on this new heading and the selector said H1 heading, no drop down. I typed in Major Heading which was the class I named my main headings. It said this class already exists. I just need to apply that class. Help!

Here is my site Read-Only: LINK
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