diff --git a/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx b/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
index e9076e4ad..4986a8de2 100644
--- a/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
+++ b/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
@@ -133,6 +133,8 @@ export function SpaceLayout(props: {
                                             )}
                                             {isMultiVariants && (
                                                 <SpacesDropdown
+                                                    /** Needed to avoid the dropdown being rendered in the wrong place when the mobile menu is open. */
+                                                    withPortal={false}
                                                     context={context}
                                                     siteSpace={siteSpace}
                                                     siteSpaces={siteSpaces}