It is possible for a story author to hide a critique, choose the critique you want to hide by going to Stories: My Critiques and find the critique you want to hide. On the critique page there is a box on the right side, marked Story Author. One of the option is to Hide Crit.
If you have already hidden the critique but want to unhide it, go to the same box and this time choose Unhide crit.
In case you do not see the critique you want to unhide when you go to Stories: My Critiques, please click on hidden crits (picture below). By clicking on this option, you are able to see hidden crits as well.
Note: If you receive destructive or inappropriate critique, please notify the Moderators by using the Report crit button on the critique page.