Can't customize theme

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When I first installed the theme I was able to go to Design > Theme > Customize and make changes to color, text color, etc. But now when I go there it's blank. When I go to Design > Theme > Customize, it's blank there are no options to see or change.

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Type: Pre-Sale
Status: New
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concrete5 Environment Information

Concrete5 8.5.4

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:93.0) Gecko/20100101 Firefox/93.0

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