How to protect conditional formatting rules in Excel?
As we all know, other users cannot view the formulas when you share the worksheet if you have formatted formula cells as hidden and then protected the sheet. However, if there are some conditional formatting rules applied in the sheet, other users can view the formula rule of the conditional formatting if they copy and paste the range cells from the protected sheet to another sheet. If you do not want the formulas in the conditional formatting rules to be viewed, here I can introduce a VBA code to help you.
Protect conditional formatting rules with VBA
Protect conditional formatting rules with VBA
To protect conditional formatting rules from being viewed by copying and pasting to other sheets, there is no direct way. But here is a VBA can prevent users copying from the protected sheet to other sheets.
1. Press Alt + F11 keys simultaneously to open Microsoft Visual Basic for Applications window.
2. In the Project pane double click at the sheet name you want to prevent copying and pasting to other sheets, and paste below VBA code to the script in the right section. See screenshot:
VBA: prevent copying and pasted cells to other sheets.
Private Sub Worksheet_Deactivate()
Application.CutCopyMode = False
End Sub
3. Save the code and close the window. From now on, the cells in this protected sheet cannot be copied and pasted to other sheets.

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Relative Article:
How to remove conditional formatting but keep format in Excel?
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