You should easily be able to either hide the widget or remove the widget completely from the sidebar.
There are three different kinds of sidebar on the community:
- Homepage
- Topic pages
- General pages (for all other pages, such as parent categories, categories)
The Homepage sidebar can be edited by → logging in as Admin or Community Manager → go to Homepage in Frontend → click on “Customize” (bottom right) → when the customizing mode has loaded, go to the widget and remove it → click “Publish”.
The other two sidebars can be configured in the Control Panel → logging in as Admin (or any users with permissions to customize) → “Customization” → “Sidebar” → you’ll find both sidebars at the right side, where you can remove the widget → Click “Save changes” (top right)