Servo Output locked on GPIO

Hello,
I’m using an old APM 2.8.0 for my MPX Easystar, during configuration with latest version of MP I’m not able to using all servos because is locked on GPIO value.
In the Servo Output tab is not possibile to change the value.
I try an old version of MP and now the Servo Output value is DISABLED.
Can anyone help me to solve this problem and use the servos?
Thanks in advance

Hello,

Sorry but didn’t catch what exactly your issue is. Would be great if few screen shot can be attached.