Let's say you've got a bunch of completed projects still sitting in your Open project list. To tidy up your project list you can:
First, sort your projects by Logistics start (You can find out more about adding the custom column here)
Next, take a look at the projects with the oldest logistics start.

Then, if these projects are completed or don't require any further action you can select them by ticking the boxes next to the projects. You can also select all projects by clicking the box in the top right.

After you've selected the projects you want to Archive, click the Archive button in the top right and confirm you want to Archive these projects.
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Finally, you can find your Archived projects here.

Now that you've cleared up your project list, you be able to focus just on projects that need your attention.