I want mandatory fields, is it possible?

Simple CRM does not do that. Numerous studies prove that it is impossible to have 100%
information in 100% of cases. These same studies show that, in the event of an obligation to have the
necessary information, users prefer to abandon the entry of the form rather than comply with the
obligations. The result is the abandonment of many opportunities, the transformation of CRM into a
"gas factory" and very often the abandonment of CRM in favour of simple Excel files that impose
nothing and adapt, because there are no constraints, to the reality on the ground.