PC - Making Items Available Online Only
Opening an item or explicitly setting it as available offline will keep a local copy on your device, in other words, they consume storage.
This step can be applied for all of your files by right clicking the OneDrive folder in File Explorer
Click on the item you made available offline
In the drop-down menu, click the “Free up space” option
Note: You can apply this step to the entire OneDrive folder if you right click that instead.
, multiple selections available,