Normally you should be able to go to the Recently Viewed page and select "Clear all" at the top to erase your recent views.
However, there seems to be a problem with getting the page to display properly using a desktop browser. You can try using the eBay app or a mobile browser -- that should still work.
Otherwise if you are using a desktop browser, go to your Summary page, and then use the link that appears on the left side of the page (rather than the link under the My eBay menu in the upper right which may not work). If you left-click on the "Recently Viewed" link on the left side of the Summary page, you may be able to load the page and use the "Clear all" link.
Purchase History cannot be deleted, only hidden.
