for specific ones you've highlighted, then apply sheet-wide protection. Standard Excel vs. Kutools While Kutools automates these processes, you can still use built-in Microsoft features for basic security: Microsoft Support Standard Encryption File > Info > Protect Workbook > Encrypt with Password Sheet Protection : Go to the tab and select Protect Sheet Microsoft Support or more info on the Master Password security settings? Protect an Excel file - Microsoft Support
If your primary need is simply removing "Read-Only" restrictions from old Excel sheets, Kutools is an excellent tool. However, if you are looking to bypass the encryption of a modern, complex password required to open a file, Kutools acts merely as a shell for standard brute-force recovery, which is not guaranteed to succeed quickly. kutools for excel password
One of the key features of Kutools for Excel is its password management capabilities. With Kutools for Excel, users can easily manage passwords for their Excel files, including: for specific ones you've highlighted, then apply sheet-wide
Managing security with Kutools is typically handled through the tab on the Excel ribbon. Protect an Excel file - Microsoft Support If