Hi there! It sounds like you're having trouble with some employees only being able to open the shared workbook in read-only mode. I can definitely help you troubleshoot this issue.

First, let's check if the file is actually set to read-only. To do this, right-click on the file and select "Properties". Under the "General" tab, make sure that the "Read-only" checkbox is not checked. If it is, uncheck it and click "Apply" and "OK".

If the file is not set to read-only, the issue may be related to the file being locked by another user. When a user opens a shared workbook, Excel creates a temporary file that is used to track changes made by all users. If this temporary file is locked by another user, it can prevent other users from opening the workbook in edit mode.

To check if the temporary file is locked, navigate to the folder where the shared workbook is saved and look for a file with the same name as the workbook, but with a ".tmp" extension. If this file exists, right-click on it and select "Properties". Under the "Security" tab, check if any users or groups have "Deny" permissions. If so, this could be preventing some users from opening the workbook in edit mode.

To resolve this issue, you may need to have the user who has the file locked close the workbook or log off of the computer to release the lock. Alternatively, you can try making a copy of the shared workbook and having the affected users open the copy instead.

Steps to check if the file is set to read-only:

1. Right-click on the file and select "Properties".
2. Under the "General" tab, make sure that the "Read-only" checkbox is not checked.
3. If it is, uncheck it and click "Apply" and "OK".

Steps to check if the temporary file is locked:

1. Navigate to the folder where the shared workbook is saved.
2. Look for a file with the same name as the workbook, but with a ".tmp" extension.
3. Right-click on it and select "Properties".
4. Under the "Security" tab, check if any users or groups have "Deny" permissions.

Let me know if you have any other questions or if there's anything else I can do to assist you.