What changes
When a season finishes and you press Next season, the screen now lists suggested moves above the boxes.
Up two, or down two. A player who won every match comfortably, and whose level sits with the box two above, is suggested to go up two boxes. The same works at the bottom for a player who lost every match.
Sitting out. A player who played nothing can be suggested to sit out the next season. That happens only if they did not put their name down when you asked the club who wants to play. If you never asked the club, it suggests nothing.
Nothing moves until you tap one. Tap Move to Box 2 or Leave it, and Undo puts the player back. Suggestions are for singles, because a pair has no level of its own.
Where to find it
On the Next season screen, once a season has finished. To switch suggestions off, untick Suggest moves when you build next season in League settings.