By default, when you insert a comment in Excel, you see the indicators only and the comments are hidden. If you want to set both indicators and comments disappear, please follow the steps below:
Step 1: Click the "File" Tab from the ribbon;
Step 2: Click "Options" from the left navigation menu;
Step 3: Click "Advanced" from the left navigation menu in the dialog box;
Step 4: Select "No comments or indicators" under the section of "Display";
Step 5: Click "OK" at the bottom to apply the changes.