Compendium Content

ive just purchased the out of the abyss compendium content. But how do I view it????

From the Compendium itself. If you are seeing the purchase page again, close and re-open the browser.

Closed it and reopened and it's still taking me to the market place

https://www.dndbeyond.com/compendium/adventures

Just click on the item you purchased.  Instead of a store page it should take you to the cover and table of contents.

Know that firefox may have some issues with the cache, so you could try another browser.

Switched from safari to google chrome and it seems to be fine now thanks