Click the 3 lines, located at the top left side corner of the screen.
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Click "All projects & organizations"
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There you are able to search for the project you wish to open.
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Once you selected the project. Under Control select "Workspaces".
To move columns, you can simply drag and drop. Let's use the pay items tab as an example
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Click "PAY ITEMS"
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On the Pay Items tab, click and hold any column, drag it to the left or right of another column.
- Two black arrows appear to guide you to the location the column will be dropped.