diff --git a/x-pack/solutions/observability/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/monitor_spaces.tsx b/x-pack/solutions/observability/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/monitor_spaces.tsx
index 70805eb05d4ab..b123a58f9b902 100644
--- a/x-pack/solutions/observability/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/monitor_spaces.tsx
+++ b/x-pack/solutions/observability/plugins/synthetics/public/apps/synthetics/components/monitor_add_edit/fields/monitor_spaces.tsx
@@ -97,6 +97,7 @@ export const MonitorSpaces = ({ value, onChange, ...rest }: MonitorSpacesProps)
   return (
     <EuiComboBox<string>
       fullWidth
+      isDisabled={rest.readOnly}
       aria-label={SPACES_LABEL}
       placeholder={SPACES_LABEL}
       isInvalid={showFieldInvalid}