Go to HR > Team

Scroll down to the team you want to affect.
Place your cursor over the employee
A button "remove" will appear next to the employee name
Click on "remove"
The employee is no longer part of the team

Go to HR > Team
Scroll down to the team you want to affect.
Place your cursor over the employee
A button "remove" will appear next to the employee name
Click on "remove"
The employee is no longer part of the team