How to hide/disable menu when the corresponding plugin is not used?

Hi

I have written a plugin for generating KDoc for Kotlin files in IntelliJ IDEA. I have registered actions in plugin.xml. 

The actual problem is, this menu will show every NOT KOTLIN projects. I only need it in Kotlin or Kotlin configured projects.

The action is in Code generation menu. But this will show in every file. If I am using a Java project or Flutter project, this menu will show.

How to hide the menu If the project is not configured Kotlin, or selected file is not a Kotlin file?

I will attach the plugin.xml

Thanks in advance

<idea-plugin>

 <extensions defaultExtensionNs="com.intellij">

        <!-- Add your extensions here -->

        <enterHandlerDelegate implementation="com.kdocer.EnterAfterKDocGenHandler" order="first"/>

        <applicationService serviceImplementation="com.kdocer.service.KDecerAppService"/>

        <applicationService serviceImplementation="com.kdocer.service.KDocerSettings"/>

        <applicationConfigurable parentId="tools" instance="com.kdocer.service.KDocerConfigurable"

                                 id="com.kdocer.service.KDocerConfigurable"

                                 displayName="KDoc-er"/>

        <enterHandlerDelegate implementation="com.kdocer.EnterAfterKDocGenHandler" order="first"/>

    </extensions>

    <actions>

        <group id="KDo-cer-format-menu" text="_KDoc-er" description="Generate KDocs" popup="true">

            <action id="KDo-cer-format-menu-all-add"

                    class="com.kdocer.action.KDocerAllGenAction"

                    text="Create KDocs for All Elements"

                    description="Generate KDocs for all elements in the current Kotlin file.">

            </action>

            <action id="KDo-cer-format-menu-add"

                    class="com.kdocer.action.KDocerGenAction"

                    text="Create KDoc for Element"

                    description="Generate KDoc for all elements in the current Kotlin file.">

            </action>

            <action id="KDo-cer-format-menu-remove"

                    class="com.kdocer.action.KDocerRemoveAction"

                    text="Remove KDoc for Element"

                    description="Remove KDoc">

            </action>

            <action id="KDo-cer-format-menu-all-remove"

                    class="com.kdocer.action.KDocerAllRemoveAction"

                    text="Remove KDocs for All Elements"

                    description="Remove KDocs">

            </action>

            <add-to-group group-id="CodeFormatGroup" anchor="last"/>

            <add-to-group group-id="ProjectViewPopupMenuModifyGroup" anchor="last"/>

        </group>

        <group id="KDo-cer-menu" text="_KDoc-er" description="Generate KDocs" popup="true">

            <action id="KDo-cer-menu-all-add"

                    class="com.kdocer.action.KDocerAllGenAction"

                    text="Create KDocs for All Elements"

                    description="Generate Kdocs for all elements in the current Kotlin file.">

            </action>

            <action id="KDo-cer-menu-add"

                    class="com.kdocer.action.KDocerGenAction"

                    text="Create KDoc for Element"

                    description="Generate Kdoc for current element.">

            </action>

            <action id="KDo-cer-menu-remove"

                    class="com.kdocer.action.KDocerRemoveAction"

                    text="Remove KDoc for Element"

                    description="Remove KDoc">

            </action>

            <action id="KDo-cer-menu-all-remove"

                    class="com.kdocer.action.KDocerAllRemoveAction"

                    text="Remove KDocs for All Elements"

                    description="Remove KDocs">

            </action>

            <add-to-group group-id="GenerateGroup" anchor="last"/>

            <add-to-group group-id="ProjectViewPopupMenuModifyGroup" anchor="last"/>

        </group>

    </actions>

</idea-plugin>