My bad. Sorry about that. I thought I saw Waypoints. Wow... 20 instrument groups.
On the App, you are pretty much going to have to delete them individually by selecting the Layout and Delete Layout. You cannot delete the "Default Layouts"
For iFly dedicated devices, it is very similar to the above for Waypoints, only you could not edit it, only delete. The file for the Custom Instruments would be the InstSettings.xml file. Delete this and it will create a new one with the defaults at boot up. Use the InstSetting with "Portrait" to remove those for groups Portrait Mode. Again, be careful when deleting filed on the SD card. some will auto generate and some will not. If in doubt, call us please.