How do I access the Second Recycle Bin if I can't get to the end of the First Recycle bin?

By the way, this feature is such bad design, it needs to be rectified!

Indeed, but in fairness to Microsoft, they did rectify this. You should now have a link visible at the bottom of the page, outside of the list controls for the files themselves. Here's how it looks for ODFB and a standard site:

If you are not seeing said link, you probably do not have sufficient permissions to access the second stage recycle bin. You can also try the following direct links:

• https://tenant-my.sharepoint.com/secondstagerecyclebin (for ODFB)
• https://tenant.sharepoint.com/_layouts/15/AdminRecycleBin.aspx?view=13 (for SPO, add the site name as needed)

Yes, you can bypass scrolling by modifying the URL directly to open the second-stage recycle bin.

Navigate to your SharePoint site's first-stage recycle bin or site collection recycle bin URL, which ends in /_layouts/15/AdminRecycleBin.aspx. Append ?view=2 to the very end of the web address, making it /_layouts/15/AdminRecycleBin.aspx?view=2. Press Enter to load the second-stage recycle bin page directly.

If the direct URL fails or times out because of a large amount of data, you can use PnP PowerShell to view and manage second-stage items directly. Open PowerShell and connect to your site as a site collection administrator using Connect-PnPOnline -Url "https://sharepoint.com". Then run Get-PnPRecycleBinItem -SecondStage to list the items in the second-stage recycle bin.

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hth

Marcin