blank bar at bottom of onedrive window

Based on the image showing the green "Outlook" header and the OneDrive file list embedded below it, this isn't a standard bug where OneDrive itself is failing. Instead, the issue appears to be a viewport height miscalculation in the interaction between the Outlook/Microsoft 365 web shell, the embedded OneDrive view, and your browser's rendering environment.

The outer container holding the OneDrive view isn't stretching to the full available height of your browser window, leaving that large white void at the bottom.

Here is the most effective, non-destructive diagnostic sequence to get this resolved. I recommend doing these in order, stopping if the issue fixes itself:

Resize/Maximize the window
Drag the edge of your browser to make it slightly smaller, then maximize it again. This forces the Microsoft 365 shell to recalculate its available viewport.

Open OneDrive directly in a new tab
Try opening a new tab and navigating directly to OneDrive via your organization's Microsoft 365 portal (or onedrive.live.com if it's a personal account). If it looks perfect there, we know the issue is isolated to the Outlook web shell's embedded view.

Reset browser zoom
Press Ctrl+0 to ensure your browser zoom is at 100%. (Avoid changing your Windows display scaling just yet—125% or 150% is perfectly normal and shouldn't need to be altered).

Hard refresh
Press Ctrl+Shift+R to bypass the cache and force the browser to redownload the layout scripts.

Test in InPrivate/Incognito
If it looks fine in a private window, an extension or cached site data is likely interfering with the shell.

Test another browser
If you're using Edge, try Chrome or Firefox. This isolates browser-specific rendering issues.

Selective site-data cleanup
Only if the above tests point to a browser state issue, clear cookies/local storage specifically for microsoft365.com or outlook.office.com. (Avoid clearing all your Microsoft cookies broadly, as it will sign you out of everything).

DevTools & Support
If the issue persists across browsers and devices, you can open DevTools (F12) and check the Console/Network tabs for errors. If there are no obvious fixes, this is likely a Microsoft-side shell defect worth reporting to Microsoft 365 Support with your screenshot.

Important Note:
Please do not run OneDrive.exe /reset. That command resets the desktop synchronization client in Windows. It will not fix a web layout rendering issue, and it could unnecessarily disrupt your locally synced files.

If standalone OneDrive renders perfectly, the problem is strongly isolated to the embedded Outlook/M365 experience—but browser-specific behavior remains a possible contributor until tested across environments.

My answers are voluntary and without guarantee!

Hope this will help you.

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