Hello, thank you for reaching out to Microsoft Q&A.
If you are using the same Microsoft account on all of your laptops and desktop PCs and syncing Office files through OneDrive, you should be able to see all of those files on all of your devices.
So, if you want to stop syncing between all of your devices that share the same Microsoft account and Office applications, the way to do this is to turn off syncing or unlink OneDrive on each computer.
To do that, right-click the OneDrive icon on the taskbar, select Settings > Backup and Sync > Manage folders, and then turn off sync for the Documents folder. (or) the folder where you saved your office files.
(You can turn on the toggle for other folders if you only want to sync those folders, such as pictures or images that you want to back up to OneDrive.)
If you want to permanently turn off OneDrive sync between each devices,
Right-click the OneDrive icon on the taskbar, select Settings > Account > Unlink this PC.
Important-
Please make sure to save your documents and spreadsheets to a local folder on your computer, as AutoSave in Office apps will be turned off once OneDrive syncing is disabled.
After unlinking OneDrive, your files will no longer be backed up to the cloud. This means you may not be able to access them online. If a device fails to turn on or becomes damaged, those files cannot be recovered from OneDrive.
Let me know if you still need more help.