diff --git a/how-to/integration-excel/client/src/excel.ts b/how-to/integration-excel/client/src/excel.ts
index e6815c7b..aa41bbdf 100644
--- a/how-to/integration-excel/client/src/excel.ts
+++ b/how-to/integration-excel/client/src/excel.ts
@@ -255,13 +255,15 @@ async function populateWorksheets(): Promise<void> {
  * @param name The name of worksheet to select.
  */
 async function selectWorksheet(name: string): Promise<void> {
-	if (openWorksheets && selectedWorksheetIndex !== undefined) {
+	if (openWorksheets && selectedWorksheetIndex === undefined) {
 		const newWorksheetIndex = openWorksheets.findIndex((w) => w.name === name);
 
 		if (newWorksheetIndex !== selectedWorksheetIndex) {
-			const oldWorksheet = openWorksheets[selectedWorksheetIndex];
-			if (oldWorksheet) {
-				await oldWorksheet.sheet.removeEventListener(handleCellChange);
+			if(selectedWorksheetIndex !== undefined) {
+				const oldWorksheet = openWorksheets[selectedWorksheetIndex];
+				if (oldWorksheet) {
+					await oldWorksheet.sheet.removeEventListener(handleCellChange);
+				}
 			}
 
 			selectedWorksheetIndex = newWorksheetIndex;
diff --git a/how-to/integration-excel/public/manifest.fin.json b/how-to/integration-excel/public/manifest.fin.json
index c40d3322..822242f9 100644
--- a/how-to/integration-excel/public/manifest.fin.json
+++ b/how-to/integration-excel/public/manifest.fin.json
@@ -22,8 +22,8 @@
 	"snapshot": {
 		"windows": [
 			{
-				"defaultWidth": 600,
-				"defaultHeight": 600,
+				"defaultWidth": 800,
+				"defaultHeight": 900,
 				"defaultLeft": 0,
 				"defaultTop": 0,
 				"saveWindowState": false,