You will need the Full Write Groups permission or be and Admin of the group to perform this action.
Two options are available when removing an individual from a group:
1 - Deleting the person
2- Adding a drop date
To keep a historical record that someone was at some point in time a member of a particular group, add a drop date.
Option 1 - Remove group member by deletion
Choose the appropriate group via Groups in the left-hand menu. Next, scroll over to the Members. Then select the 3-dots menu located next to the individual's name and Delete.
Note: this will delete any history that this person was ever connected to this group.
Option 2 - Remove group member by adding a drop date
Choose the appropriate group via Groups in the left-hand menu. Next, scroll over to the Members. Select Edit after clicking on the 3-dots menu beside the person's name.
On the pop-up screen add the date dropped in the appropriate field.
These two actions can also be performed on an individual's profile.
First, navigate to the person's profile, select the Involvement tab, then the group. From there, select the Delete button to delete the person from the group or Edit to add a drop date.
Helpful Tip: To add or drop people from a group using automation, see this article.