logical check for show_history_button

Author: Ian Seabock (Centific Technologies Inc)

frontend/src/pages/layout/Layout.tsx

@@ -77,7 +77,7 @@ const Layout = () => {
             </Link>
           </Stack>
           <Stack horizontal tokens={{ childrenGap: 4 }} className={styles.shareButtonContainer}>
-            {appStateContext?.state.isCosmosDBAvailable?.status !== CosmosDBStatus.NotConfigured && (
+            {appStateContext?.state.isCosmosDBAvailable?.status !== CosmosDBStatus.NotConfigured && ui?.show_chat_history_button !== false && (
               <HistoryButton
                 onClick={handleHistoryClick}
                 text={appStateContext?.state?.isChatHistoryOpen ? hideHistoryLabel : showHistoryLabel}