designer is already approver lifecycle

Remove that person as an approver? ☺

Is that designer allowed to approve other objects through that workflow?

Write custom code in the workflow that checks for the designer and if that person is also in the approver list, remove them from the approver list temporarily for that object.

Hello @FC_9723361, 
 

It looks like you have a response to your topic. If it helped to solve your question please mark the reply as the Accepted Solution. 

Of course, if you have more to share on your issue, please let the Community know so other community members can continue to help you.

Thanks,
Community Moderation Team.