Modify Page Layouts for Custom Metadata Types
Custom Metadata Types include fields that represent aspects of the metadata. You can change which fields are displayed for a metadata type by editing the layout.
To edit the page layout for a Custom Metadata Type:
Go to Setup (gear icon) > Setup, then search for and select Custom Metadata Types.
Find the Custom Metadata Type that contains the page you want to edit, then select Manage Records.
In the Label column, select any Metadata Type for editing.
Select the arrow on the right to expand the pull-out menu, then select Edit Layout.
Drag the fields you need from the Layout section to the desired location(s) in the Sample section.