How to sort existing drafts in inbox into separate work spaces?

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Answer and discussion of basically the same question in this thread, hopeful helps clarify:

Moving drafts between workspaces

Workspaces are not containers. A draft is not “in” a workspace, exactly. They are sets of filters and options you can apply to get different views of your drafts. More detail in the user guide article. Most commonly, they are used with tags. So, a simple example, you might set up a “Personal” workspace, with a tag filter of “personal”. When you select that workspace, only drafts with the tag “personal” assigned are visible in the list. So making a draft appear in that workspace is simply a mat…