Changing hidden/visible fields

How I can change the fields that are hidden or visible in a given project, but every time I navigate away from that project, it reverts BACK to the default. Can I pick what fields are visible or not and just have it stay that way? I want “assignee” hidden and “tags” unhidden.

Hi @Julia_Westbrook do you see a save button on the far right hand side appear after applying the hidden fields?