When "Manage Channel Members" is set, to true for All Members, There is no option to remove other channel members.
The permission is working as expected for other roles.
Ensure a license is applied
In the permission configuration Ensure Manage Channel Members is true for public channels for All Members
Login as a user who is not a Team Admin or System Admin
Join a public channel to ensure test user is not a channel admin
Open the channel drop down
Note that the option correctly reads "Mange Members" and not "View Members"
Click "Manage Members"
Note the "Add Members" option is correctly displayed
Expected: There should be a "Remove Member" button next the channel members
Observed: There is no way to remove members