There is no button for fine-tuning modules on weapons at max level (Call of Duty: Modern Warfare 2 (2022))

In general, after I pumped a couple of barrels to the max level, I opened a window supposedly with the ability to fine-tune each module on this weapon BUT nothing like that appears there. I watched videos from people, just above the module an additional button appears for fine-tuning, I don’t have it. Who has the same problem? or I don't understand something?