Starting with phpMyAdmin 4.0.0, double-click now the new standard for cell editing. If you want, you can completely disable cell editing or change it by one click by adding a line to config.inc.php :
$cfg['GridEditing'] = 'disabled'; //disabled cell/grid editing completely $cfg['GridEditing'] = 'click'; //single-click editing $cfg['GridEditing'] = 'double-click'; //default value. No need to specify this except for maybe readability purposes
Source: phpMyAdmin Documentation at $ cfg ['GridEditing']
Update: You can also simply configure GridEditing from the phpMyAdmin user interface by going to "Settings"> "Main panel"> "Overview"> "Grid editing: trigger action"
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