Managing layout themes
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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 ([ ]). The # of Layouts column shows the number of layouts that use each theme.
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In the Manage Themes dialog box:
 
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                                                             To  | 
                                                        
                                                             Do this  | 
                                                    
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                                                             Rename a theme  | 
                                                        
                                                             Select a custom theme, click Rename, then type a new name. Tip By default, a custom theme has the same name as the predefined FileMaker Pro theme on which it is based. To avoid confusion, rename the custom theme.  | 
                                                    
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                                                             Duplicate a theme  | 
                                                        
                                                             Select a theme, and click Duplicate.  | 
                                                    
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                                                             Copy and paste a theme  | 
                                                        
                                                             When the Use advanced tools general setting is selected, select a theme and press Ctrl+C (Windows) or Command-C (macOS), then press Ctrl+V (Windows) or Command-V (macOS). Note See Changing general settings.  | 
                                                    
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                                                             Delete a theme  | 
                                                        
                                                             Select a theme, then click Delete.  | 
                                                    
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                                                             Set a theme as the default  | 
                                                        
                                                             Select a theme, then click Set as Default. The default theme is used when creating new layouts. Setting a default theme has no effect on existing layouts.  |