Add the below entry under <alfresco-config> tag in share-config-custom.xml file(located at either tomcat\webapps\share\WEB-INF\classes\alfresco\web-extension OR tomcat\shared\classes\alfresco\web-extension)
<config evaluator="string-compare" condition="DocumentLibrary" replace="true">
<multi-select>
<action type="action-link" id="onActionDownload" icon="document-download" label="menu.selected-items.download" />
<!– commented copy to.
<action type="action-link" id="onActionCopyTo" icon="document-copy-to" label="menu.selected-items.copy" />
–>
<action type="action-link" id="onActionMoveTo" icon="document-move-to" permission="Delete" label="menu.selected-items.move"/>
<action type="action-link" id="onActionAssignWorkflow" asset="document" icon="document-assign-workflow" label="menu.selected-items.assign-workflow"/>
<action type="action-link" id="onActionDelete" icon="document-delete" permission="Delete" label="menu.selected-items.delete" notAspect="hwf:hybridWorkflow,sys:undeletable" />
<action type="action-link" id="onActionCloudSync" asset="document" icon="document-cloud-sync" permission="CreateChildren" label="menu.selected-items.cloudSync" notAspect="sync:syncSetMemberNode" syncMode="ON_PREMISE" />
<action type="action-link" id="onActionCloudSyncRequest" icon="document-request-sync" label="menu.selected-items.cloudRequestSync" hasAspect="sync:syncSetMemberNode" syncMode="ON_PREMISE" />
</multi-select>
</config>