From https://us.community.samsung.com/t5/A-Series-Other-Mobile/How-to-turn-off-check-background-power-use-notification/td-p/3065357

Try this:

⁃   Settings  ≻
⁃   Apps  ≻
⁃   Click The Icon:

⁃   Turn “Show System Apps” on  ≻
⁃   Press OK  ≻
⁃   Go to “Android System”  ≻
⁃   Notifications  ≻
⁃ Notifications  Categories  ≻
⁃   Turn “App Consuming Battery” Off.