Managing layout themes
You can use the Manage Themes dialog box to view a list of all the themes in a file as well as the number of layouts that use each theme. You can rename custom themes, duplicate themes in the list, and delete themes from the file.
To manage themes:
1.
Choose File menu > Manage > Themes.
You see a list of all the themes available in the file. Predefined themes (themes that come with FileMaker Pro) are enclosed in brackets (for example, [Cool]). The # of Layouts column shows the number of layouts that use each theme.
2.
 
Select a custom theme, click Rename, then type a new name.
3.
Click OK to close the Manage Themes dialog box.
Notes
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Related topics 
Renaming a layout theme
Saving a layout theme
Importing layout themes