Solved

Circuit Selection

As a league manager, under edit, there is a button labeled "Circuit Selection". Clicking it, has a pop up with 2 panes. The left pane has the current season tracks and the left is available tracks. My league just finished a season and will start up again in 1 week.

How do i alter the selected tracks? i.e. i don't seem to be able to move or drag any track around and don't see any other buttons, etc. to use.

Is this feature ready for use?

You should be able to drag tracks to the right to de-select them and to the left to select them for next season. 
NOTE: You cannot save the calendar for next season if it has less than, or more than, 15 circuits on it. 

Is random set to off? You cannot drag and drop if random is set to on

This doesn't seem to work in Chrome (primary browser i use), but it did in Firefox. Doesn't surprise me since the interactive game doesn't play well in Chrome either (for me). I have to use Firefox for that. 

So i have set 15 races, but it isn't being reflected on the league tab's schedule. How do i tell the game to use the new selections?

When you select a calendar, it will update for NEXT season. So if you pick 15 tracks at the 1st race of Season 14, they will change in season 15. 

Please consider this issue resolved (unless the game designers want to test in Chrome). 

I have marked this thread as solved.