Visual Alert for BLF Pickup - limit to group only

[Maciejp]

We just rolled out 3cx with Yealink phones (T46U). People love BLFs buttons - see who is busy / who is talking (with Visual Alert for BLF Pickup enabled)
But quickly realized that they now receiving tons of alerts to pickup phones do not really belonging to their calling groups.

So it looks that by enabling every new BLF key on your phone automatically you will be notified about every calls to those extenstions!
(I think obvious expectation is to see only assigned pickup groups notifications)

Thus question is - does anyone know how configure this to have BLFs working and be informed about only own groups connections ?
(It would be really pity if I had to resign from BLFs - this was one of selling point when we decided to move to 3cx / voip solution...)

Thanks in advance for any tips !