When working with the Active Choice CheckBox parameter, you can select the default values by adding the ": selected" parameter
Pipeline:
properties([ parameters([ [$class: 'CascadeChoiceParameter', choiceType: 'PT_CHECKBOX', description: 'Select environment', filterLength: 1, filterable: false, name: 'Environment', script: [ $class: 'GroovyScript', script: [ classpath: [], sandbox: false, script: 'return[\'Development:selected\',\'Production:selected\']' ] ] ] ]) ])
When assembling with parameters, two environments at once, "Development" and "Production" will be selected by default
Plz let me know how to list the property key values from gitlab to my Jenkins parameterized job using active choice reactive parameter