Claim

When you are declarer, you can claim any number of tricks of the remaining cards in play by clicking
on  

Make sure if you don't have only top trick left to announce the line of play you are going to take before claiming.

When you claim the opponents will see all cards left for all the hands and can decline your claim if they think that they are able to defend against your line of play, giving you less tricks than first claimed.

When all remaining tricks are yours without any doubt, then it is courteous to claim and proceed to next hand, not to slow down the game.