This hotfix includes a fix which hasn’t been included in the most current Rollup Update.
It fixes an interface issue where the dialog box is too small to display all the text and the drop-down menu when you try to change the retention policy of a folder in a shared mailbox.
Note: This is a Hotfix and not a regular update. You can request it via its KB article page. This fix will also be included in the next Rollup Update.