The answer is yes. You can remove a client from your client list in your workspace without losing information of the past transactions done, which will still appear in your Sales section.
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Consentio Webapp
Access to your Workspace section and click on Clients.
Click on the client you would like to remove from your Workspace.
Next, go to the Privacy and security section.
Select the Remove client button and a new window will be open. Click again on the Remove client button to confirm this action.
This client will no longer appear among your client list but you can add the client back to your workspace at any point.
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Consentio Mobile App
Currently the option of removing clients from your workspace is only available for Consentio Webapp.