Right click the file you'd like to restore to a previous version and click on "Version history" below the blue cloud icon
Then click the 3 dots next to the date wanted to download/restore to.
Then click "Download" to download a copy of that older file, or restore to replace the file in it's current location.
For more information on restoring files in OneDrive, see https://support.microsoft.com/en-us/office/restore-a-previous-version-of-a-file-stored-in-onedrive-159cad6d-d76e-4981-88ef-de6e96c93893