The following method allows for efficient management:
1. Create a team that includes all registered users
Manage user teams (Web Browser)
https://teachme.jp/8/manuals/4929282
2. Add the created team to all folders
Add/exclude teams to folders (Web browser)
https://teachme.jp/8/manuals/42082645
After that, when adding or removing users, by adding/removing them to the team created in 1., the permission settings will be applied to all folders.