If a folder has been created in any way, more apps can be added to the folder afterwards. Samsung offers several options for this. either the hold and drag method, or the simpler method via the edit menu. the latter is particularly recommended if several apps are to be added to the folder. a maximum of 40 apps can be added to a folder.

Android 10 (One UI 2.0)
Step 1:  Open the  folder  you want
Step 2:  Tap on  Add
Step 3:  Choose all  apps  you want
Step 4:  Confirm with  Done
  1. Open the folder you want
  2. Tap on Add
  3. Choose all apps you want
  4. Confirm with Done

Samsung Instructions
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