Suggested by Daniel Goehler – Under Review
In Business Cental 16.2 if you select all lines in a Page, Ctrl+C copies only the first 50 lines, but not all. This should be inproved at least to 1000.
Status Details
Thank you for your feedback. We are considering adding it to our longer term roadmap.In the meantime, the solution is to scroll down so that the Web client loads more records, and then use Ctrl+A to select all before copying with Ctrl+C. This will allow you to copy as many records as you have scrolled, which can be more than 50.
See this and other frequently asked questions here: https://docs.microsoft.com/en-us/dynamics365/business-central/ui-copy-paste#what-is-the-maximum-number-of-rows-that-can-be-copied
Your help is greatly appreciated,
Mike Borg Cardona,
Program Manager, Microsoft 
If I am on a Configuration Page Line and do a lookup on the Table No's, do I select all, then scroll to the very very very last record on the list of tables. Once BC reached the last record, had they all been cached.
Ctrl+C does a Copy All
Paste them all into Excel, to get a complete list of the table list for the relevant release's table listing.
The missing link is the patience to scroll to the bottom, then you will get them all in your quest to Copy ALL.
The BC designers had disabled the cash all not seen & not visited records, to save processing time on the servers.
There was a reason to enhance system speed, to not cash all invisible records, that you can see, but scroll down to see them.