Right-side pane and the account viewing it #1959
Description
When opening the right-side pane, e.g. by clicking a post or a profile, it isn't obvious which account is being used for it. (You have to actively remember which account you opened the pane as.) For posts, this means that you may not know whether to react by using the actions directly or using the "react from other account" menu. For profiles, it means that you don't see from which perspective an account is being followed etc.
It would be helpful to see the active account in the head of the pane as is the case with all the column panes.