This is a basic question. I created a list and the source is a “user” glide table with multiple users. When viewing on the front-end, it only shows my profile and not all users.
If you have row ownership configured, only the row owners will have visibility and access to the data that matches the signed-in user for the column that is marked as the row owner.
If you need publicly available user information, I would recommend you create a “public” version of an users table that is populated with users information that is to made public custom actions.