Tags and custom fields are not currently specific to a library.
If you want to choose which custom fields from your workspace are visible in a specific library, head to your library settings. Under advanced, custom fields can be modified to a hidden or visible setting according to your preference!
Have more product ideas? Share them with us! Head to https://airlabs.canny.io to access our product board, submit your feedback, and help us build a better creative operations platform for you and your team.