In the System Settings (a gear in the right upper corner), in the Advanced Planning Settings section, there is an option to allow users to view plan values with up to 3 decimal places.

If Units values scale is set to 0, the system will round values of the plan. Once 1, 2 or 3 option is chosen, the plan will indicate values with respective number of decimals.

The example below illustrates 'Units values scale' set to 2