When more and more contacts accumulate in your app, it will be harder to manage the contacts tags efficiently. In this case, you can make use of the Tags Manager, which allows you filter out the target group of contacts, and manage their contacts tags all at once.
The Tags Manager can be found in the right sidebar inside "MEMBERS".
In the sidebar of the Members page, there is a section called "Existing Tags".
This is a list of member tags that will appear as suggestions when you are adding member tags, allowing you to quickly re-use the existing member tags.
Please note that removing tags from this list does not affect the tags applied to any member. It will only remove the tags from the suggestions.