High level overview of the selected cluster
In case you move some shards around, click on the shards you willing to move, each shard click will be marked for relocation, then select the destination node you want to be in. After relocation started you will be able to see the progress below each shard
Click on the top left button inside the table in order to change allocation settings
Clicking on index name opens lots of options to configure, inspect and operate the current index.