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user need 'checked out by others' option and 'lock' option both to be visible while adding to workspace.
Both the options should be in different columns
Is this a question or are you requesting PTC to add that?
If you are requesting PTC change the software to do that, you can post in the Windchill Ideas area.
https://community.ptc.com/t5/Windchill-Ideas/idb-p/WindchillIdeas