I accidentally allowed software to load when asked. How do I find out what I allowed (and block it again if needed)?
It will depend on precisely what permission it was requesting - though note for future reference you're going to see a lot of these with Mojave, so get into the habit of reading carefully; even to the extent of researching exactly what it is you're allowing before clicking either option. Some apps will never ask again &amp; then you may lose functionality.

Generally, these allowed apps are listed in System Prefs > Security &amp; Privacy > Privacy &amp; then whichever subsection they requested permission for. [I think] The two new options in there since Mojave are Full Disk Access &amp; Automation.
I don't know of any way to determine the date the permission was granted.



Of course, once identified, there is a simple checkbox to allow/disallow.