The team name next to the channel name is redundant on Recent Mentions when the user logs into only the single team.

actual

The team name next to the channel name in the header of each message is always displayed however many teams the user logs into.

expected

The team name next to the channel name in the header of each message should be displayed when the user logs into more than one team (that is, 2+ teams).

as is

to be (for example)

When the user logs into only the single team: