Please read our Release Notes for an important change to how the dashboard panels work in ThemeBuilder 5.4.0+ for Confluence 5.9+
The default Confluence Dashboard shows a Welcome Message, Get Started section, Spaces/Pages/Network lists and Recent Updates for Popular, All Updates, Favourite Spaces and Network.
For ThemeBuilder skins to be used on the Dashboard, or in other global areas such as search, profiles and space administration, the Site Theme in Confluence Administration > Look and Feel > Themes must be set to ThemeBuilder.
If you wanted to remove the Get Started section you would find and remove the macro from the Dashboard panel in the Skin Editor.
Find the panel-element with the name ‘page.dashboard.actions’ and remove the whole macro.