You can control the order in which categories are arranged in the left hand sidebar menu.
To do so, visit the categories page:
Once you're there, use the drag-and-drop feature (9-dot icon) to reorder your categories.
After you've settled on an order, refresh the page and those changes should immediately populate in the sidebar menu.
Pinning Pages to the Dashboard
Do you have a few docs your team accesses regularly? Would you like to keep your account overview docs/welcome pages in one place? You can do this by pinning these pages to your dashboard!
Simply enter a published page and/or click the kebab menu to the right of the page title.
Select "Pin to dashboard", navigate to your dashboard, and you should see your newly-pinned article at the top of page!