Theme options
From LimeSurvey Manual
LimeSurvey 3 introduces a complete new template engine system, based on Twig 1.29 and Bootstrap, and allowing template inheritance and template options.
Install Limesurvey 3.0+ to get access to the survey theme options feature. This option will not be made available in the older LimeSurvey versions!
Introduction
LimeSurvey 3 contains a new feature called theme options that offers a set of various tools that allows the LimeSurvey users to quickly and easily change the templates-related settings of their surveys.
Theme options panel
Access the new theme options feature from the settings menu, you get access to the simple and advanced options (see the toolbar).
Simple options
The Inherit everything option lets you decide whether you want the survey group to inherit everything or not from the parent survey group theme.
If you do not want this to happen, select "No". Then, the following options will be displayed: