By default, folders on Samsung devices with One UI do not have a folder name, but you can add or change one from the Home screen.

Android 10 (One UI 2.0)
Step 1:  Open the  Folder  you want
Step 2:  Tap on (current)  Folder name
Step 3:  Enter new  folder name  and confirm with  Done
  1. Open the Folder you want
  2. Tap on (current) Folder name
  3. Enter new folder name and confirm with Done

Samsung Instructions
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