resetting controlsource cells
 

The code that you've supplied shows a named range, however, you have not
specified the values for that range. Also, your sheet name appears to
refer to a cell address instead of the actual sheet name. Try something
like below:

Sheet1.Range("Opaque").value = "FALSE"

Furthermore, you state that the controls are in a user form, but can I
assume that the checkboxes are linked to the below range? If not,
please let me know and I can further assist.

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