I noticed the Grid option on these tabs for Functions, Procedures, Packages, Materialized Views, etc. displays phantom scrollbars. (Toad 188.8.131.529)
I am able to reproduce this. This only happens when a color scheme is enabled, and only when "Grid" is selected in the deps tabs.
In version 16.2, I don't get the scrollbars, but I can tell something is still wrong there too because the last column header in the grid is not colored properly.
I'll fix it for 17.0. Thanks.
I just downloaded and installed 16.2 so hopefully I get a chance to test it soon.