Yes, you may disable a widget. If you disable a widget it will not be seen on your profile which means none of your contacts will be able to use it again while it's disabled. If you added the widget code to your website it will disappear.
To disable the widget, go to your Seller > Dashboard click on the 3 dots on the right side of the widget, then click on "Disable Widget" from the drop-down menu.
You will be able to re-enable, edit, or delete your widget from your dashboard anytime. At the bottom of your widget list it will say "Active" and "Inactive". Just click on "Inactive" and you can re-enable any inactive widgets from the inactive widgets page.