In Activity Diagram, like this:
@startuml
skinparam style strictuml
start
:Activity 1;
repeat
:Activity 2;
:Activity 3;
repeat while (condition) is (yes) not (no)
:Activity 4;
stop
@enduml
You get this graphics diagram, in this, can see then yes/no of the repeat condition.
But, when include "skinparam conditionStyle InsideDiamond", you can not see then yes/no of the repeat condition.
@startuml
skinparam style strictuml
skinparam conditionStyle InsideDiamond
start
:Activity 1;
repeat
:Activity 2;
:Activity 3;
repeat while (condition) is (yes) not (no)
:Activity 4;
stop
@enduml
View here
Regards