The below article has an overview of all the settings that would be available in Manage Workspace
Path: Workspace Homepage >> Apps Icon >> Manage Workspace
Manage Workspace consists of mainly four settings which allows to customise and set up the workspace features as per the requirements. Once the settings has been enabled it will be applicable for all the communities under this workspace. However in case the community admin would like to make changes at the community level it will override the workspace settings for that particular community only.
General Settings
This setting allows to set up the workspace with four sub-settings mainly the workspace info, language settings, email and notifications and member profile questions. 
To learn more about these settings: General Settings
Customization
This section allows to make changes to enhance the look & feel for the workspace according to preference by using and changing various settings.
To learn more about these settings: Customization
Security: This section allows you to set various types of access restrictions or auto approvals, curse filtering as well as SSL security & Government compliance settings. This also has settings which enabled to set up various types of logins for your user.
To learn more about these settings: Security
Data Management: This setting allows the admin of the workspace to mange, erase or delete members and communities.
To learn more about these settings: Data Management