Why are applications disappearing from the Edge screen?

Q: 

Recently, applications that where added on the Edge screen unintentionally disappeared from the Edge screen. 

A: 

Samsung is aware of this occurrence which may happen on some Android Q OS devices, and is scheduled to release an improved application update soon. Therefore, please check for updates to your device SW and applications regularly via FOTA.

Samsung encourages users to keep software and apps updated to the latest version. 

For proper operation before release, follow the next steps.

1. Go to Settings > Device care > Battery > App power management > Deep sleeping apps

If there is a disappeared application in the deep sleeping apps lists, remove it

2. Go to Settings > Device care > Battery > Apps that won't be put to sleep 

Please add the applications to use at Apps panel.