Re: PIC16F18326 cannot disable MSSP1 ints using MCC
I am not able to understand your question and what's the solution that you are looking for.
From the MCC side,
1) SPI in Master mode doesn't support interrupt ( even though you can check the Interrupt). "Notifications" tab shows the message on the same.
2) SPI in Slave mode support Interrupt.
In any case, i am able to "check or uncheck" the MSSP1 interrupts.
while adding the query please add the library versions that are been used. That help to verify.