STM32WB55RGVx --- why cannot I not select LSE on one of the projects?

[SWenn.1]

I have two projects one was created some time ago with STM32CubeMX V6.10.1 and it shows me having 'blue' Enable CSS button for the LS mux the other is created with STM32CubeMX V6.12.1 (using the same exact part) YET it is greyed out.  How do I change this or what am I missing that keeps me from selecting the LSE on this project?  (See clock config pictures below and notice how the one allows me to select many of the fields and the other does not)

[SWenn.1 · Accepted solution]

solved....RCC Configuration --"Generate the peripherals clock configuration" must be set to TRUE