Leaving a Facebook group using a PC
Log into your Facebook account and click the ‘Groups’ tab on the left side of your screen on your Facebook Home page.
Click on the group you want to leave in the ‘Groups you’ve joined’ section.
This brings you to the group’s home page. Click on the three dots to bring out a pop-up menu. Select and click ‘Leave group’ from this pop-up menu.
A window will appear, confirming if you really want to leave.
Click ‘Leave Group.’ You have now left that Facebook group.
*** There is also a toggle option for you to prevent people from inviting you to join the group again. Turn that on if you want to.