From the docs...take your pick...

TasksWrapCount 0
- Sets the maximum number of tiles that can be
displayed in one direction, before wrapping.
- accepts any positive integer or the following:
Set to 0 to disable.
Set to -1 to autowrap.
- defaults to: 0

TasksMaxTiles 0
- Sets the maximum number of tiles that can be
displayed.
- accepts any positive integer. Use 0 to disable.
When disabled, the maximum is limited by your
system memory.
- defaults to: 0