diff --git a/ghost/admin-x-settings/src/components/settings/site/ThemeModal.tsx b/ghost/admin-x-settings/src/components/settings/site/ThemeModal.tsx
index 6f078176df..e3ef51aaf8 100644
--- a/ghost/admin-x-settings/src/components/settings/site/ThemeModal.tsx
+++ b/ghost/admin-x-settings/src/components/settings/site/ThemeModal.tsx
@@ -41,6 +41,8 @@ const ThemeToolbar: React.FC<ThemeToolbarProps> = ({
 }) => {
     const api = useApi();
     if (selectedTheme) {
+        const installedTheme = themes.find(theme => theme.name.toLowerCase() === selectedTheme.name.toLowerCase());
+
         return (
             <div className='sticky top-0 flex justify-between gap-3 bg-white p-5 px-7'>
                 <div className='flex w-[33%] items-center gap-2'>
@@ -65,16 +67,17 @@ const ThemeToolbar: React.FC<ThemeToolbarProps> = ({
                     />
                     <Button
                         color='green'
-                        label={`Install ${selectedTheme?.name}`}
+                        disabled={Boolean(installedTheme)}
+                        label={installedTheme?.active ? 'Activated' : (installedTheme ? 'Installed' : `Install ${selectedTheme?.name}`)}
                         onClick={async () => {
                             const data = await api.themes.install(selectedTheme.ref);
-                            const installedTheme = data.themes[0];
+                            const newlyInstalledTheme = data.themes[0];
                             setThemes([
                                 ...themes.map(theme => ({...theme, active: false})),
-                                installedTheme
+                                newlyInstalledTheme
                             ]);
                             showToast({
-                                message: `Theme installed - ${installedTheme.name}`
+                                message: `Theme installed - ${newlyInstalledTheme.name}`
                             });
                             setCurrentTab('installed');
                         }}