Reorder Apps from the Samsung Gear app
 

1:From the Home screen of your mobile device, touch Apps.
2:Touch Samsung Gear.
3:Touch the SETTINGS tab.
https://s2.postimg.org/8xqf29hih/us_...ngs-_Touch.jpg
4:Touch Apps.
https://s2.postimg.org/40cugr2k9/us_...ngs-_Touch.jpg
5:Touch MORE > Reorder.
6:Touch the arrow icon to the right of the app you want to move and drag it to a new location on the list
https://s2.postimg.org/9brr1ied5/us_...s3_Reorder.jpg
7:Touch Back to return to Apps settings when you are finished reordering

Reorder Apps from Gear S3
1:Touch and hold the Apps screen containing the app you want to move.
2:Touch and hold the app you want to move.
3:Drag the app to the preferred location.