I recently migrated from a 5508 WLC to a 9800. On the 5508, when viewing all APs, there was a "Change Filter" option that would let you filter the view based on various options such as name, MAC address, or Model. I do not see any similar options on the 9800. There is a search box that can quickly find APs by name, however that search function sends me to the "AP Statistics", which doesn't give the ability to make configuration changes. In order to make changes, I need to find the AP from the list in Configuration -> Wireless -> Access Points, which has no search function.
I also have another issue with the way the sorting works on the Access Points view. The page can only display up to 100 APs at a time, and I have about 250, so it spans 3 pages. When I try sorting by AP, rather than sorting my whole inventory, it only sorts the 100 APs already on the page, so if I have 30 APs that start with the letter A, I might only see 20 on the first page, and have to find the rest of the top of page 2 or 3.
The end result of both of these issues is that it is very difficult to find and make changes to a specific AP. Am I missing something or do I just need to learn to learn to get used to searching this way?