Just so you know, deleting a project will permanently delete all the time entries related to it. The action is not reversible.
(Why not archive the project instead?)
You can delete a project from the Project view. Please note that before you can delete it, you need to archive the project first.
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Go to Projects;
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Use the filters to select the archived projects;
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Select the project you want to delete;
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Select DELETE.
Please note that deleting a project is a permanent operation and cannot be undone, that also deletes the project's entries as well: