Add routes for the admin interface:
Route::prefix('admin')->group(function () {
Route::get('content-settings/edit', [App\Http\Controllers\Admin\ContentSettingsController::class, 'edit'])->name('admin.content-settings.edit');
Route::put('content-settings/update', [App\Http\Controllers\Admin\ContentSettingsController::class, 'update'])->name('admin.content-settings.update');
});