Manually creating weeks

I have an athlete who is transitioning to a body recomposition/strength training focused block for the next 12-weeks. I’d like to have 3x strength training sessions and 2x endurance sessions planned for them. No matter how I manipulate the settings, I can’t seem to get the software to give me enough strength training. So, I’d like to manually create weeks but I can’t seem to do that if I go unscheduled.

In short, can I manually create a 12-week plan to fit my athletes needs or does everything have to be completely AI generated?