I skipped the previous couple of years but in the past the agenda planner allowed for double booking / scheduling of sessions. This has always been extremely helpful since sometimes a session isn't expected so you want a second or even third choice preplanned. I see that double booking is not allowed when trying to add more than one session at the same time.
Also, you can add the same session to your calendar when there are multiple sessions times. When initially session planning, I like to through the schedule I will add the same session to my schedule when there are multiple session times that way I can decide later which time works best.
Please consider adding back those capabilities back to the Detailed Agenda Schedule before the UC. I'm sure I'm not the only one who misses that functionality. Thanks.