Hi @Gonzalez, Susana,
From your description I understand that you want to show the field when the value of "ReleaseLanes" field is "Epic Release" or "BAU Release" and the value of "Tower" field is not "Servicing", right? You can use the below formula to achieve this:
=if(([$ReleaseLanes] == 'Epic Release' && [$Tower] != 'Servicing') || ([$ReleaseLanes] == 'BAU Release' && [$Tower] != 'Servicing'), 'true', 'false')
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