Some refinements.

src/homeScreen/HomeScreen.tsx

@@ -29,6 +29,8 @@ import ConfirmSheetPasteDialog from "./dialogs/ConfirmSheetPasteDialog";
 import ImportExampleDialog from "./dialogs/ImportExampleDialog";
 import LLMDevPauseDialog from "@/homeScreen/dialogs/LLMDevPauseDialog";
 import { LOAD_URL } from "@/common/urlUtil";
+import { HorizontalScroll } from "@/components/sheetTable/SheetTable";
+import { doesSheetHaveWritableColumns } from "@/sheets/sheetUtil";
 
 function HomeScreen() {
   const [sheet, setSheet] = useState<HoneSheet|null>(null);
@@ -37,13 +39,28 @@ function HomeScreen() {
   const [job, setJob] = useState<ExecutionJob|null>(null);
   const [modalDialog, setModalDialog] = useState<string|null>(null);
   const [promptTemplate, setPromptTemplate] = useState<string>('');
+  const [sheetHorizontalScroll, setSheetHorizontalScroll] = useState<HorizontalScroll>(HorizontalScroll.CLEAR);
   const [, setLocation] = useLocation();
 
   useEffect(() => {
     init(setAvailableSheets, setModalDialog, setLocation).then(() => { });
     return deinit;
   }, []);
 
+  useEffect(() => {
+    if (!sheet) return;
+    if (doesSheetHaveWritableColumns(sheet)) {
+      setSheetHorizontalScroll(HorizontalScroll.RIGHT); // To show newly added column.
+      return;
+    }
+    setSheetHorizontalScroll(HorizontalScroll.LEFT);
+  }, [sheet]);
+
+  useEffect(() => {
+    if (sheetHorizontalScroll === HorizontalScroll.CLEAR) return;
+    setSheetHorizontalScroll(HorizontalScroll.CLEAR); // Reset so it can be set again later.
+  }, [sheetHorizontalScroll]);
+
   const promptPaneContent = !sheet ? null : 
     <PromptPane 
       sheet={sheet} className={styles.promptPane} 
@@ -59,6 +76,7 @@ function HomeScreen() {
       </div>
       <SheetPane 
         sheet={sheet} className={styles.sheetPane} selectedRowNo={selectedRowNo} 
+        horizontalScroll={sheetHorizontalScroll}
         onRowSelect={setSelectedRowNo}
         onImportSheet={() => setModalDialog(ImportOptionsDialog.name)}
         onExportSheet={() => chooseExportType(setModalDialog)}

src/homeScreen/SheetPane.tsx

@@ -1,12 +1,13 @@
 import Pane, { ButtonDefinition } from "@/components/pane/Pane";
 import { getComment } from "./interactions/comment";
 import HoneSheet from "@/sheets/types/HoneSheet";
-import SheetTable, { GeneratedFooterText } from "@/components/sheetTable/SheetTable";
+import SheetTable, { GeneratedFooterText, HorizontalScroll } from "@/components/sheetTable/SheetTable";
 
 type Props = {
   sheet: HoneSheet|null,
   className:string,
   selectedRowNo:number,
+  horizontalScroll:HorizontalScroll,
   onRowSelect:(rowNo:number)=>void
   onExportSheet():void,
   onImportSheet():void
@@ -16,16 +17,16 @@ function _noSheetLoadedContent() {
   return <div>No sheet loaded.</div>;
 }
 
-function _sheetContent(sheet:HoneSheet|null, selectedRowNo:number, _onRowSelect:(rowNo:number)=>void) {
+function _sheetContent(sheet:HoneSheet|null, selectedRowNo:number, _onRowSelect:(rowNo:number)=>void, horizontalScroll) {
   if (!sheet) return _noSheetLoadedContent();
   const onSelectCell = (_colNo:number, rowNo:number) => _onRowSelect(rowNo);
   return <SheetTable 
     selectedRowNo={selectedRowNo} sheet={sheet} footerText={GeneratedFooterText.ROW_COUNT} 
-    onSelectCell={onSelectCell} displayRowCount={20} />;
+    onSelectCell={onSelectCell} displayRowCount={20} horizontalScroll={horizontalScroll}/>;
 }
 
-function SheetPane({sheet, className, onImportSheet, selectedRowNo, onRowSelect, onExportSheet}:Props) {
-  const content = _sheetContent(sheet, selectedRowNo, onRowSelect);
+function SheetPane({sheet, className, onImportSheet, selectedRowNo, onRowSelect, onExportSheet, horizontalScroll}:Props) {
+  const content = _sheetContent(sheet, selectedRowNo, onRowSelect, horizontalScroll);
 
   const buttons:ButtonDefinition[] = [
     { text:'Import', onClick:() => onImportSheet() }, 

src/homeScreen/dialogs/ExecuteDialog.module.css

@@ -1,3 +1,21 @@
 .progress {
   height: 3vh;
+}
+
+@keyframes shimmer {
+  0% {
+    background-position: -200%;
+  }
+  100% {
+    background-position: 200%;
+  }
+}
+
+.prompt {
+  display: inline-block;
+  background: linear-gradient(90deg, rgba(.5, .1, 0, 0.2), rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.2));
+  background-size: 200% auto;
+  color: transparent;
+  -webkit-background-clip: text;
+  animation: shimmer 1.5s infinite;
 }

src/homeScreen/dialogs/ExecuteDialog.tsx

@@ -40,9 +40,9 @@ function ExecuteDialog({onCancel, isOpen, job, onComplete, onUpdateJob}:Props) {
   const middleContent = cancelRequestReceived 
     ? <p>One moment<WaitingEllipsis trailing/></p>
     : <>
-      <p>Current prompt: "{job.currentPrompt}"</p>
+      <p>Current prompt: <span className={styles.prompt}>{job.currentPrompt}</span></p>
       <p>Response: <GeneratedText text={responseText} /></p>
-      <p>Time remaining:{job.timeRemainingText}</p>
+      <p>Time remaining: {job.timeRemainingText}</p>
     </>
 
   return ( // Intentionally not passing "onCancel" to ModalDialog as I don't want a click-away to cancel the job. User must click the "cancel" button.