First, select the map for which you'd like to see the list of optimal picks by clicking on
the map container in the top left corner.
After that, the picking phase will begin. Search for the brawler you
wish to pick
for the next player and press enter or click on the brawler portrait to select it.
The "Top picks" section under the picks box shows the best brawlers to
be picked by player currently
highlighted with the rainbow border. The pick order is the same as in game.
If you wish to reset the pick phase you can either click on the reset
icon, press R on your keyboard,
or pick all the brawlers and select another one. Happy picking!