Some projects have a decent amount of proposal items while some others are greedily count hundreds of them. And then, when raising an invoice and allocating the amount under a single proposal item, you'll have to scroll through these hundreds of items. Sounds fun
(not!)
. Now, with this tick box next to your allocations, you can only view those that have actually an amount next to them. The scroll wheel of your mouse should already be a tad happier.