Hello,
I don’t know if it’s a bug, but I can no longer see the slider to select the number of hours per week in the plan builder.
Thank you
For now, yes it’s gone, and not sure if it’s coming back but personally I found that the AI just used that as a rough guideline anyway! I’d set at 6 or 8 hours for example when coming off some illness/injury and it would vary from 7-10 still to get the mix of activities to hit my goals. Long way of saying that with or without the slider, I saw the same hours 
I’d recommend just going with the closest one, use the workout wizard to replace workouts as needed, and feel free to delete extras (my approach is to get the key HIIT sessions in and at least some of each category like strength and aerobic, and delete those that’re duplicated like a second or third aerobic or long session).
PS. You can use the “custom schedule” to get closer, but remember per other threads, if you put too many constraints like setting 6 hours on a Saturday, it may assume that you’re asking for 6 hours on Saturday not just available for that much on Saturday. I believe it’s something the team is working on updating and clarifying - but of course is not top priority while they work on ironing out the plan builder and other items from the recent overhaul. fwiw