Go to your Admin tab and select Tools. You will find the following panel under Other:
Click on the button to add a new tab to the top of your space. Select the new tab. You will see a form where you can configure your custom tab.
Now, sort your tab into the position that you want. You can go back to the Admin tab and select Appearance. You will see a Navigation panel where you can drag your tabs into the order you want.
Examples of Use
I get a management report with key financial numbers on a Google spreadsheet. After moving it to a custom tab, I look at it more frequently.
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