We haven't yet figured out how to hide (or incinerate with prejudice) all those lovely excess Overseer quest rewards, but here is a quick efficiency trick I only recently discovered that simplifies the process of setting up missions. Take a look!
The premium Overseer window has also gotten several nice quality-of-life improvements: You can double-click missions in the list to complete them -- very handy when you have a long daily list to reset. The window is resizable so you can see more missions at once and enjoy the excellent artwork on the Agent Collection tab. You have a continuous XP percentage display on the XP bar plus a raw experience display for each mission. Tiny trait icons have been sized up a bit, and of course the entire window has been scaled up to 2K- and 4K-friendly sizes.
The quested Overseer bag can also be trained to open and close only when you open and close your personal inventory bags, rather than the quirky default behavior when you visit banks.