Show section tabs when there is a single section group present

Author: zenoachtig

.changeset/modern-adults-scream.md

@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Show tabs when there is a single section group present

packages/gitbook/src/components/Header/Header.tsx

@@ -211,11 +211,13 @@ export function Header(props: { context: GitBookSiteContext; withTopHeader?: boo
                                     />
                                 </div>
                             )}
-                            {sections && sections.list.length > 1 && (
-                                <SiteSectionTabs
-                                    sections={encodeClientSiteSections(context, sections)}
-                                />
-                            )}
+                            {sections &&
+                                (sections.list.some((s) => s.object === 'site-section-group') || // If there's even a single group, show the tabs
+                                    sections.list.length > 1) && ( // Otherwise, show the tabs if there's more than one section
+                                    <SiteSectionTabs
+                                        sections={encodeClientSiteSections(context, sections)}
+                                    />
+                                )}
                         </div>
                     </div>
                 </div>