Your sideloaded non-gear certified apps will disappear once you open Gear Manager. Gear manager does not support non-Gear certified apps.
If you need Gear Manager to adjust some settings, then Just set whatever you need in Gear Manager, back out. Then restart your Gear.
All your sideloaded apps will remain in the launcher as long as you don't open Gear Manager.
This needs to be a sticky, too many people ask the same question in a day.
Why don't people use search these days?
Please Thanks if it helped!