There might be another way to track down tables but here is how I navigate to them.
Navigate to: make.powerapps.com
From the top-right of the page select the environment you want to work in.
In the left-nav, click on Tables, then select the table you want to work with.
I was trying to update an Access database from a classic ASP page and encountered this error:
[Microsoft][ODBC Microsoft Access Driver] Operation must use an updateable query.
The fix is outlined here:
In a modern OS, you need add the local IUSR account to the folder that holds your database. The account will need read and write access.
Who knew that classic ASP was so much fun to work with?